概述
用以扩展jQuery对象
参数
object
例子
合并两个对象，并修改第一个对象。
<!Doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery.extend demo</title>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<div id="log"></div>
<script>
var object1 = {
apple: 0,
banana: { weight: 52, price: 100 },
cherry: 97
};
var object2 = {
banana: { price: 200 },
durian: 100
};
// 合并 object2 到 object1
$.extend( object1, object2 );
// 转换成json字符串
$( "#log" ).append( JSON.stringify( object1 ) ); //{"apple":0,"banana":{"price":200},"cherry":97,"durian":100}
</script>
</body>
</html>
采用递归方式合并两个对象，并修改第一个对象。
<!Doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery.extend demo</title>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<div id="log"></div>
<script>
var object1 = {
apple: 0,
banana: { weight: 52, price: 100 },
cherry: 97
};
var object2 = {
banana: { price: 200 },
durian: 100
};
// Merge object2 into object1, recursively
$.extend( true, object1, object2 );
// Assuming JSON.stringify - not available in IE<8
$( "#log" ).append( JSON.stringify( object1 ) ); //{"apple":0,"banana":{"weight":52,"price":200},"cherry":97,"durian":100}
</script>
</body>
</html>
合并 defaults 和 options 对象，并且不修改 defaults 对象。这是常用的插件开发模式。
<!Doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery.extend demo</title>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<div id="log"></div>
<script>
var defaults = { validate: false, limit: 5, name: "foo" };
var options = { validate: true, name: "bar" };
// Merge defaults and options, without modifying defaults
var settings = $.extend( {}, defaults, options );
// Assuming JSON.stringify - not available in IE<8
$( "#log" ).append( "<div><b>defaults -- </b>" + JSON.stringify( defaults ) + "</div>" );
$( "#log" ).append( "<div><b>options -- </b>" + JSON.stringify( options ) + "</div>" );
$( "#log" ).append( "<div><b>settings -- </b>" + JSON.stringify( settings ) + "</div>" );
/*
* defaults -- {"validate":false,"limit":5,"name":"foo"}
* options -- {"validate":true,"name":"bar"}
* settings -- {"validate":true,"limit":5,"name":"bar"}
*/
</script>
</body>
</html>
