delete

JavaScript：delete 操作符

详细说明

delete操作符用于删除一个对象、对象的属性或数组中的元素。该操作符也能删除未通过var语句声明的变量。

Version

实现于JavaScript 1.2

Syntax

delete objectName
delete objectName.property
delete objectName[index]
delete property // The command acts  only within a with statement.

执行一下

参数说明

objectName：对象的名称。

property：该属性为objectName对象的现有属性。

index：表示数组索引的整数。

Example:

以下网页文档演示了delete操作符的用法。

HTML代码

<!doctype html>
<head>
<meta charset="utf-8">
<title>JavaScript function operator example with DOM
</title>
<meta name="description" content="This document contains
an example of JavaScript function operator using DOM" />
<style>
h1 {
color:red;
border-bottom: 3px groove silver;
padding-bottom: 8px;
}
</style>
</head>
<h1>JavaScript function operator example</h1>
<script src="javascript-function-operator-example1.js">
</script>
</body>
</html>

执行一下

JS代码

var fruits = new Array("Orange", "Apple", "Banana", "Chery");
var newParagraph = document.createElement("p");
var newText = document.createTextNode("Fruits List : " + fruits);
newParagraph.appendChild(newText);
document.body.appendChild(newParagraph);
//Delete the array object.
delete fruits;
var newParagraph1 = document.createElement("p");
var newText1 = document.createTextNode("Display the Fruits after delete the array object - Fruits List : "+ fruits;);
newParagraph1.appendChild(newText1);
document.body.appendChild(newParagraph1);

执行一下

另请参阅

条件运算符
 comma
function
in
instanceof
new
this
typeof
void

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JavaScript：delete 操作符

详细说明