tryjs_operators4 在线代码实例

实例代码( Tip: 登录后体验更佳 )
运行代码

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<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
</head>
<body>
<p>点击按钮创建及增加字符串变量。</p>
<button onclick="myFunction()">点击这里</button>
<p id="demo"></p>
<script>
function myFunction()
{
    txt1="What a very";
    txt2="nice day";
    txt3=txt1+" "+txt2;
    document.getElementById("demo").innerHTML=txt3;
}
</script>
</body>
</html>
 
 
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运行结果
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