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1. javascript函数eval()
语法:
var obj = eval ("(" + txt + ")"); //必须把文本包围在括号中,这样才能避免语法错误
eval()定义:eval() 函数可计算某个字符串,并执行其中的的 JavaScript 代码。
由于 JSON 语法是 JavaScript 语法的子集,JavaScript 函数 eval() 可用于将 JSON 文本转换为 JavaScript
对象。
注意:当字符串中包含表达式时,eval() 函数也会编译并执行,转换会存在安全问题。
2. 浏览器自带对象JSON,JSON.parse()
语法:
var obj = JSON.parse(text[, reviver]) //text:必需, 一个有效的 JSON 字符串。解析前要确保你的数据是标准的
JSON 格式,否则会解析出错。 //reviver: 可选,一个转换结果的函数, 将为对象的每个成员调用此函数。
JSON.parse()比eval()安全,而且速度更快。支持主流浏览器:Firefox 3.5,IE 8,Chrome,Opera 10,Safari 4。
注意:IE8兼容模式,IE 7,IE 6,会存在兼容性问题。
3. jQuery插件,$.parseJSON()
语法:
var obj = $.parseJSON(json) //json:String类型,传入格式有误的JSON字符串可能导致抛出异常
4. ajax请求获取json数据时,$.getJSON()
语法:
jQuery.getJSON(url,data,success(data,status,xhr)) //url 必需。规定将请求发送的哪个 URL。
//data 可选。规定连同请求发送到服务器的数据。 //success(data,status,xhr) 可选。规定当请求成功时运行的函数。
这个时候返回的data已经是JSON对象,不需要再进行转换。
$.getJSON() 是简写的 Ajax 函数,等价于:
$.ajax({ url: url, data: data, success: callback, dataType: "json" });