我想改变“;text1”;至“;text2”;第一次点击并改变“;text2”;至“;text1”;第二次只点击一个按钮

i want to change "text1" to "text2" first click and change "text2" to "text1" second click by only single button

本文关键字：text2 text1 改变 一个 按钮 第二次 第一次      更新时间：2023-09-26

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

我想第一次点击将"text1"更改为"text2"，第二次点击仅需一个按钮即可将"text2"更改为"text 1"。

您缺少返回语句：

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

或使用else:

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

您刚刚错过了else语句。

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>

相关文章：