Question

像在按钮onclick功能中从右向左翻转一样水平旋转图像。我试图通过简单的功能翻转图像。

    var looper;
        var degrees = 0;
        function SetTransform(el,speed)
        {
            degrees = 0;
            Transform(el,speed);
        }       

        function Transform(el,speed){ 
            var cog1 = document.getElementById(el);
            cog1.style.WebkitTransform = "rotate("+degrees+"deg)";
            if(degrees <=359)
            {
            looper = setTimeout('Transform(\''+el+'\','+speed+')',speed);
            }
             degrees++;
            
            document.getElementById("status").innerHTML = "rotate("+degrees+"deg)";
        }

Answer 1

您可以使用tranform属性通过简单的事件处理程序和单一样式来实现相同的目的

此处的示例

const myFunction=()=>{
    document.getElementById('target').style.transform='scaleX(-1)';
}

<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>

<h2>Flip an Image</h2>
<button onclick="myFunction()">Click to Flip the Image</button>
<div>
<img src="https://www.cameraegg.org/wp-content/uploads/2015/06/canon-powershot-g3-x-sample-images-1.jpg" alt="Paris" width="400" height="300" id="target">
</div>
</body>
</html>

也：如果您希望图像从右向左翻转，反之亦然，则每次单击按钮时，您可以添加一个 Js中的简单情况如下所示。

const myFunction=()=>{
    var styles=document.getElementById('target').style;
    if(styles.transform==='scaleX(-1)')
        styles.transform='scaleX(1)';
    else
        styles.transform='scaleX(-1)';
}

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>

<h2>Flip an Image</h2>
<button onclick="myFunction()">Click to Flip the Image</button>
<div>
<img src="https://www.cameraegg.org/wp-content/uploads/2015/06/canon-powershot-g3-x-sample-images-1.jpg" alt="Paris" width="400" height="300" id="target">
</div>
</body>
</html>

请告诉我我是否有帮助：）

Answer 2

正如我上面所说的，只需在点击时使用transfrom: scaleX(-1);

注意：如果您不希望过渡，则将其从图像中删除。

document.getElementById('flip').onclick  = function(){
  document.getElementById('img').classList.toggle("flipped");
}

img.flipped {transform: scaleX(-1)}


/*just for demo purpose*/
button {margin-left: 30px;}
body {display: flex; align-items: center;}
img {height: 180px; width: 270px; transition: transform 1s;}

<img id="img" src="https://images.freeimages.com/images/large-previews/7bc/bald-eagle-1-1400106.jpg">

<button id="flip">Flip Image</button>

Answer 3

快速简单：

function flip(el) {
  el.classList.toggle('flipped');
}

.flipped {
  transform: scaleX(-1);
}

<img src="https://source.unsplash.com/random/500x500" onclick="flip(this)">

Answer 4

var rotate_interval;
document.addEventListener("DOMContentLoaded", function() {
  var button = document.getElementById("rotate_button");
  button.addEventListener("click", function() {
    var rotate = parseInt(this.dataset.rotate, 10);
    if (rotate == 0) {
      this.dataset.rotate = 1;
      this.innerText = "Stop rotate";
      rotate_interval = setInterval(rotateElement, 10);
    } else {
      this.dataset.rotate = 0;
      this.innerText = "Start rotate";
      clearInterval(rotate_interval);
    }
  });
});

function rotateElement() {
  var img = document.getElementById("rotate_img");
  var angle = parseFloat(img.dataset.angle, 10);
  var speed = parseFloat(img.dataset.speed);
  var new_angle = angle + speed;
  if (new_angle < -1 || new_angle > 1){
    speed = -speed;
    new_angle = angle + speed;
  }
  img.dataset.angle = new_angle;
  img.dataset.speed = speed;
  img.style.transform = 'scaleX(' + new_angle + ')';
}

img#rotate_img {
  width: 100px;
  height: 100px;
}

<img src="https://lh3.googleusercontent.com/-_Zp3yhfoB3w/AAAAAAAAAAI/AAAAAAAAAAA/ACHi3rftojcGs3QomG3vHceiX8VtM98v6g/photo.jpg" id="rotate_img" data-angle="1.0" data-speed="-0.01" />
<button type="button" id="rotate_button" data-rotate="0">Start rotate</button>

您可以将当前角度存储在data-属性中，并通过element.dataset.ATTRIBUTE_NAME

进行访问

像翻转一样水平旋转图像

4 个答案: