Question

＆＃13;

function fun(){
  
  var read1 = document.getElementById("ddr");
  
  if(read1.innerHTML == "text2"){
    read1.innerHTML = "text1";
    
  }
  
  
  read1.innerHTML = "text2"
  
  
}

＆＃13;

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <button id="bt" onclick="fun()"> button </button>
  <p id="ddr">
    text1
  </p>
</body>
</html>

＆＃13;

我想改变＆＃34; text1＆＃34;到＆＃34; text2＆＃34;首先点击并更改＆＃34; text2＆＃34; to＆＃34; text1＆＃34;只需按一下按钮。

Answer 1

您缺少退货声明：

function fun(){
  var read1 = document.getElementById("ddr");

  if(read1.innerHTML == "text2"){
    read1.innerHTML = "text1";
    return; //return here
  }
  read1.innerHTML = "text2"
}

或else：

function fun(){
  var read1 = document.getElementById("ddr");

  if(read1.innerHTML == "text2"){
    read1.innerHTML = "text1";
  } else {
    read1.innerHTML = "text2"
  }
}

Answer 2

您错过了else声明。

function fun(){
    var read1 = document.getElementById("ddr");
  
    if(read1.innerHTML == "text2"){
        read1.innerHTML = "text1";        
    }
    else{    
        read1.innerHTML = "text2"
    }
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <button id="bt" onclick="fun()"> button </button>
  <p id="ddr">
    text1
  </p>
</body>
</html>

我想改变＆＃34; text1＆＃34;到＆＃34; text2＆＃34;首先点击并更改＆＃34; text2＆＃34; to＆＃34; text1＆＃34;第二次单击仅按一个按钮

2 个答案: