我想将“ text1”更改为“ text2”，第一次单击，然后将“ text2”更改为“ text1”，第二次单击只需单击一个按钮

Question

 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>

i want to change "text1" to "text2" first click and change "text2" to "text1" second click by only single button. 我想将“ text1”更改为“ text2”，第一次单击，然后将“ text2”更改为“ text1”，第二次单击只需单击一个按钮。

Answer 1

You are missing return statement: 您缺少返回声明：

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

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

or with else : 或与else ：

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

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

Answer 2

You just missed the else statement. 您只是错过了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>

我想将“ text1”更改为“ text2”，第一次单击，然后将“ text2”更改为“ text1”，第二次单击只需单击一个按钮

问题描述

2 个解决方案

解决方案1
0 已采纳 2016-01-09 11:51:00

解决方案2
0 2016-01-09 11:57:07

我想将“ text1”更改为“ text2”，第一次单击，然后将“ text2”更改为“ text1”，第二次单击只需单击一个按钮

问题描述

2 个解决方案

解决方案1 0 已采纳 2016-01-09 11:51:00

解决方案2 0 2016-01-09 11:57:07

解决方案1
0 已采纳 2016-01-09 11:51:00

解决方案2
0 2016-01-09 11:57:07