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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runcodex.com)</title>
</head>
<body>
<p>删除数组元素,长度不会变化。</p>
<p>delete 运算符并不是彻底删除元素,而是删除它的值,但仍会保留空间。</p>
<p id="demo"></p>
<script>
var myObj, i, x = "";
myObj = {
"name":"网站",
"num":3,
"sites":[ "Google", "Runcodex", "Taobao" ]
};
delete myObj.sites[1];
x = "sites.length = " + myObj.sites.length + "<br><br>";
for (i in myObj.sites) {
x += i + " " + myObj.sites[i] + "<br>";
}
document.getElementById("demo").innerHTML = x;
</script>
</body>
</html>
输入 JavaScript 代码……
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输入 CSS 代码……