prototype中的$H函数的用法

更新时间：2022-10-02 20:24:33

将对象转为hash对象

Creates a Hash (which is synonymous to "map" or "associative array" for our purposes). A convenience wrapper around the Hash constructor, with a safeguard that lets you pass an existing Hash object and get it back untouched (instead of uselessly cloning it).

The $H function is the shorter way to obtain a hash (prior to 1.5 final, it was the only proper way of getting one).

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>$H</title>
<script type="text/javascript" language="javascript"
src="prototype.js" ></script>
<script>
function test()
{
// 创建一个对象,对于像sucre这样的字符串要记得加引号
var obj = {
userName: 'sucre',
password: 'secret',
age: 27
};
// 将其转换为Hash对象
var hash = $H(obj);
alert(hash.toQueryString());
}
function getValue(){
var h = $H({name: 'sucre', age: 27, country: 'China'});
// Equivalent to:
var hh = new Hash({name: 'sucre', age: 27, country: 'China'});
// Can then be accessed the classic Hash way
var country = h.get('country');
var name = hh.get('name');
//看到了输出的结果是一样的，说明$H与new Hash是一回事
alert("h中的country:"+country+"\r\n"+"hh中的name:"+name);
}
</script>
</head>
<body>
<form>
<input type="button" value="转换" onclick="test()" />
<input type="button" value="取值" onclick="getValue()" />
</form>
</body>
</html>

本文转自sucre03 51CTO博客，原文链接：http://blog.51cto.com/sucre/410405，如需转载请自行联系原作者

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prototype中的$H函数的用法

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