正确更改z索引以堆叠SVG

Question

我的问题是如何堆叠SVG，它们通过间隔不断改变宽度和高度？

说明：

svg＃1一旦达到指定的宽度和高度，它将被重置 到0，并且应该是z-index较高的那个。

SVG＃2的z-index低于SVG＃1，SVG＃3的z-index低于SVG ＃2。

SVG＃27的z-index会比SVG＃26的低。 SVG＃27达到特定高度后，它将重置并应具有 z-index比SVG＃1

高

这应该通过间隔循环。

这是我当前的代码，但我不知道上述场景的流程：

function getRandomColor() {
	
  var letters = '0123456789ABCDEF';
	
  var color = '#';
	
  for (var i = 0; i < 6; i++) {
		
    color += letters[Math.floor(Math.random() * 16)];
		
  }
	
  return color;
	
}

setInterval(myMethod, 10);

function myMethod( )
{

if(parseFloat(jQuery('.fs1').css('width'))>=5400){

jQuery('.fs1').css('width',0);

jQuery('.fs1').css('height',0);

jQuery('.fs1 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs1').css('width','+=2');

jQuery('.fs1').css('height','+=2');

}

if(parseFloat(jQuery('.fs2').css('width'))>=5400){

jQuery('.fs2').css('width',0);

jQuery('.fs2').css('height',0);

jQuery('.fs2 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs2').css('width','+=2');

jQuery('.fs2').css('height','+=2');

}

if(parseFloat(jQuery('.fs3').css('width'))>=5400){

jQuery('.fs3').css('width',0);

jQuery('.fs3').css('height',0);

jQuery('.fs3 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs3').css('width','+=2');

jQuery('.fs3').css('height','+=2');

}

if(parseFloat(jQuery('.fs4').css('width'))>=5400){

jQuery('.fs4').css('width',0);

jQuery('.fs4').css('height',0);

jQuery('.fs4 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs4').css('width','+=2');

jQuery('.fs4').css('height','+=2');

}

if(parseFloat(jQuery('.fs5').css('width'))>=5400){

jQuery('.fs5').css('width',0);

jQuery('.fs5').css('height',0);

jQuery('.fs5 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs5').css('width','+=2');

jQuery('.fs5').css('height','+=2');

}

if(parseFloat(jQuery('.fs6').css('width'))>=5400){

jQuery('.fs6').css('width',0);

jQuery('.fs6').css('height',0);

jQuery('.fs6 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs6').css('width','+=2');

jQuery('.fs6').css('height','+=2');

}

if(parseFloat(jQuery('.fs7').css('width'))>=5400){

jQuery('.fs7').css('width',0);

jQuery('.fs7').css('height',0);

jQuery('.fs7 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs7').css('width','+=2');

jQuery('.fs7').css('height','+=2');

}

if(parseFloat(jQuery('.fs8').css('width'))>=5400){

jQuery('.fs8').css('width',0);

jQuery('.fs8').css('height',0);

jQuery('.fs8 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs8').css('width','+=2');

jQuery('.fs8').css('height','+=2');

}

if(parseFloat(jQuery('.fs9').css('width'))>=5400){

jQuery('.fs9').css('width',0);

jQuery('.fs9').css('height',0);

jQuery('.fs9 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs9').css('width','+=2');

jQuery('.fs9').css('height','+=2');

}

if(parseFloat(jQuery('.fs10').css('width'))>=5400){

jQuery('.fs10').css('width',0);

jQuery('.fs10').css('height',0);

jQuery('.fs10 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs10').css('width','+=2');

jQuery('.fs10').css('height','+=2');

}

if(parseFloat(jQuery('.fs11').css('width'))>=5400){

jQuery('.fs11').css('width',0);

jQuery('.fs11').css('height',0);

jQuery('.fs11 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs11').css('width','+=2');

jQuery('.fs11').css('height','+=2');

}

if(parseFloat(jQuery('.fs12').css('width'))>=5400){

jQuery('.fs12').css('width',0);

jQuery('.fs12').css('height',0);

jQuery('.fs12 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs12').css('width','+=2');

jQuery('.fs12').css('height','+=2');

}

if(parseFloat(jQuery('.fs13').css('width'))>=5400){

jQuery('.fs13').css('width',0);

jQuery('.fs13').css('height',0);

jQuery('.fs13 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs13').css('width','+=2');

jQuery('.fs13').css('height','+=2');

}

if(parseFloat(jQuery('.fs14').css('width'))>=5400){

jQuery('.fs14').css('width',0);

jQuery('.fs14').css('height',0);

jQuery('.fs14 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs14').css('width','+=2');

jQuery('.fs14').css('height','+=2');

}

if(parseFloat(jQuery('.fs15').css('width'))>=5400){

jQuery('.fs15').css('width',0);

jQuery('.fs15').css('height',0);

jQuery('.fs15 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs15').css('width','+=2');

jQuery('.fs15').css('height','+=2');

}

if(parseFloat(jQuery('.fs16').css('width'))>=5400){

jQuery('.fs16').css('width',0);

jQuery('.fs16').css('height',0);

jQuery('.fs16 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs16').css('width','+=2');

jQuery('.fs16').css('height','+=2');

}

if(parseFloat(jQuery('.fs17').css('width'))>=5400){

jQuery('.fs17').css('width',0);

jQuery('.fs17').css('height',0);

jQuery('.fs17 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs17').css('width','+=2');

jQuery('.fs17').css('height','+=2');

}

if(parseFloat(jQuery('.fs18').css('width'))>=5400){

jQuery('.fs18').css('width',0);

jQuery('.fs18').css('height',0);

jQuery('.fs18 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs18').css('width','+=2');

jQuery('.fs18').css('height','+=2');

}

if(parseFloat(jQuery('.fs19').css('width'))>=5400){

jQuery('.fs19').css('width',0);

jQuery('.fs19').css('height',0);

jQuery('.fs19 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs19').css('width','+=2');

jQuery('.fs19').css('height','+=2');

}

if(parseFloat(jQuery('.fs20').css('width'))>=5400){

jQuery('.fs20').css('width',0);

jQuery('.fs20').css('height',0);

jQuery('.fs20 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs20').css('width','+=2');

jQuery('.fs20').css('height','+=2');

}

if(parseFloat(jQuery('.fs21').css('width'))>=5400){

jQuery('.fs21').css('width',0);

jQuery('.fs21').css('height',0);

jQuery('.fs21 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs21').css('width','+=2');

jQuery('.fs21').css('height','+=2');

}

if(parseFloat(jQuery('.fs22').css('width'))>=5400){

jQuery('.fs22').css('width',0);

jQuery('.fs22').css('height',0);

jQuery('.fs22 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs22').css('width','+=2');

jQuery('.fs22').css('height','+=2');

}

if(parseFloat(jQuery('.fs23').css('width'))>=5400){

jQuery('.fs23').css('width',0);

jQuery('.fs23').css('height',0);

jQuery('.fs23 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs23').css('width','+=2');

jQuery('.fs23').css('height','+=2');

}

if(parseFloat(jQuery('.fs24').css('width'))>=5400){

jQuery('.fs24').css('width',0);

jQuery('.fs24').css('height',0);

jQuery('.fs24 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs24').css('width','+=2');

jQuery('.fs24').css('height','+=2');

}

if(parseFloat(jQuery('.fs25').css('width'))>=5400){

jQuery('.fs25').css('width',0);

jQuery('.fs25').css('height',0);

jQuery('.fs25 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs25').css('width','+=2');

jQuery('.fs25').css('height','+=2');

}

if(parseFloat(jQuery('.fs26').css('width'))>=5400){

jQuery('.fs26').css('width',0);

jQuery('.fs26').css('height',0);

jQuery('.fs26 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs26').css('width','+=2');

jQuery('.fs26').css('height','+=2');

}

if(parseFloat(jQuery('.fs27').css('width'))>=5400){

jQuery('.fs27').css('width',0);

jQuery('.fs27').css('height',0);

jQuery('.fs27 path').attr('fill',getRandomColor());

}

else{

jQuery('.fs27').css('width','+=2');

jQuery('.fs27').css('height','+=2');

}

}

.heart-container {
	position: fixed;
	z-index: -999;
	width: 100%;
	height: 100%;
	left: 0;
	top: 0;
}

.rainbow {
	position: absolute;
	left: 50%;
	top: 50%;
	transform: translate(-50%, -50%);
}

.fs1 {
	width: 5200px;
	height: 5200px;
	z-index: 27;
}
.fs2 {
	width: 5000px;
	height: 5000px;
	z-index: 26;
}
.fs3 {
	width: 4800px;
	height: 4800px;
	z-index: 25;
}
.fs4 {
	width: 4600px;
	height: 4600px;
	z-index: 24;
}
.fs5 {
	width: 4400px;
	height: 4400px;
	z-index: 23;
}
.fs6 {
	width: 4200px;
	height: 4200px;
	z-index: 22;
}
.fs7 {
	width: 4000px;
	height: 4000px;
	z-index: 21;
}
.fs8 {
	width: 3800px;
	height: 3800px;
	z-index: 20;
}
.fs9 {
	width: 3600px;
	height: 3600px;
	z-index: 19;
}
.fs10 {
	width: 3400px;
	height: 3400px;
	z-index: 18;
}
.fs11 {
	width: 3200px;
	height: 3200px;
	z-index: 17;
}
.fs12 {
	width: 3000px;
	height: 3000px;
	z-index: 16;
}
.fs13 {
	width: 2800px;
	height: 2800px;
	z-index: 15;
}
.fs14 {
	width: 2600px;
	height: 2600px;
	z-index: 14;
}
.fs15 {
	width: 2400px;
	height: 2400px;
	z-index: 13;
}
.fs16 {
	width: 2200px;
	height: 2200px;
	z-index: 12;
}
.fs17 {
	width: 2000px;
	height: 2000px;
	z-index: 11;
}
.fs18 {
	width: 1800px;
	height: 1800px;
	z-index: 10;
}
.fs19 {
	width: 1600px;
	height: 1600px;
	z-index: 9;
}
.fs20 {
	width: 1400px;
	height: 1400px;
	z-index: 8;
}
.fs21 {
	width: 1200px;
	height: 1200px;
	z-index: 7;
}
.fs22 {
	width: 1000px;
	height: 1000px;
	z-index: 6;
}
.fs23 {
	width: 800px;
	height: 800px;
	z-index: 5;
}
.fs24 {
	width: 600px;
	height: 600px;
	z-index: 4;
}
.fs25 {
	width: 400px;
	height: 400px;
	z-index: 3;
}
.fs26 {
	width: 200px;
	height: 200px;
	z-index: 2;
}
.fs27 {
	width: 0px;
	height: 0px;
	z-index: 1;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

<div class="heart-container">
<svg class="rainbow fs1" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs2" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs3" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs4" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs5" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs6" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs7" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs8" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs9" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs10" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs11" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs12" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs13" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs14" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs15" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs16" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs17" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs18" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs19" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs20" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs21" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs22" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs23" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs24" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs25" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs26" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg><svg class="rainbow fs27" viewBox="0 0 199.6 184.15">
      <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
    </svg>
</div>

https://codepen.io/anon/pen/EMMKKb

Answer 1

无法使用SVG来堆叠z-index。使元素排在最前面的唯一方法是使元素排在文档顺序的最后。当然，这可以通过jQuery的appendTo来实现。

从这个问题中我得出结论，你是在不断不断地“增长”重叠的心。我可以随意使用scale和requestAnimatioFrame而不是增加宽度和setInterval，这两者在性能和节省机器资源方面都更好。我删除了27个元素中的最后一个元素，将缩放比例除以25个元素的增量步骤要容易得多。我已经自动完成了该过程，因此不必按照样式进行定义（除非您要创建后备广告）。

Codepen

var ratio = {}, speed = 0.001;

function getRandomColor() {

  var letters = '0123456789ABCDEF';
  var color = '#';

  for (var i = 0; i < 6; i++) {
    color += letters[Math.floor(Math.random() * 16)];
  }

  return color;
}

$('.rainbow').each(function(index) {

  var mark = $(this).attr('class').split(' ').pop();
  ratio[mark] = 1-index*0.04;

  $(this).css('transform', 'translate(-50%, -50%) scale(' + ratio[mark] + ')');

});

function myMethod() {

  $('.rainbow').each(function() {

    var item = $(this),
    size = this.getBoundingClientRect().width,
    tag = item.attr('class').split(' ').pop();

    if (size > 5400) {
      ratio[tag] = 0;
      item.appendTo('.heart-container').find('path').attr('fill', getRandomColor());
    }
    else ratio[tag] = ratio[tag]+speed;

    item.css('transform', 'translate(-50%, -50%) scale(' + ratio[tag] + ')');
  });

  requestAnimationFrame(myMethod);
}

requestAnimationFrame(myMethod);

.heart-container {
  position: fixed;
  width: 100%;
  height: 100%;
}

.rainbow {
  width: 5200px;
  height: 5200px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div class="heart-container">
  <svg class="rainbow fs1" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs2" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs3" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs4" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs5" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs6" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs7" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs8" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs9" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs10" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs11" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs12" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs13" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs14" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs15" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs16" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs17" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs18" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs19" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs20" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs21" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs22" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs23" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs24" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs25" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
  <svg class="rainbow fs26" viewBox="0 0 199.6 184.15">
    <path fill="#4687BF" d="M146.69 0A52.9 52.9 0 0 0 99.8 28.37 52.92 52.92 0 0 0 0 52.91a53 53 0 0 0 .69 8.5C9.47 117.63 99.8 184.12 99.8 184.12s90.33-66.49 99.11-122.71a53 53 0 0 0 .69-8.5A52.91 52.91 0 0 0 146.69 0z"></path>
  </svg>
</div>

我本来希望通过在每个元素上使用data属性来跟踪当前缩放比例，但是SVG当前也不支持。因此，我在脚本中使用了名为ratio的对象，通过使用特定的类并存储它们的瞬时scale来保持跟踪。否则，我会为此使用元素的初始索引的顺序，但是使用appendTo时会改变。

增长速度可以设置在顶部。