tryjsref_oper_plusequal 在线代码实例

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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>x = 10 ， y = 5, 计算  x += y,  x 为:</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
    var x = 10;
    var y = 5;
    x += y;
    document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>
 
 
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运行结果
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