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简明json介绍

　　本文标签：json

在JS中我们可以直接定义一个对象：

复制代码 代码如下:

var obj={name:"蓝色",age:10};

上面其实就是所谓的JSON了，我引用下别人的复杂点的例子：
复制代码 代码如下:

{ firstName: "Brett", lastName:"McLaughlin", email: "brett@jb51.net" }

复制代码 代码如下:

{ people: [
{ firstName: "Brett", lastName:"McLaughlin", email: "brett@jb51.net" },
{ firstName: "Jason", lastName:"Hunter", email: "jb51.net" },
{ firstName: "Elliotte", lastName:"Harold", emai": "elharo@jb51.net" }
]}
{ people1: [
{ firstName: "Brett", lastName:"McLaughlin", email: "brett@jb51.net" },
{ firstName: "Jason", lastName:"Hunter", email: "jb51.net" },
{ firstName: "Elliotte", lastName:"Harold", emai": "elharo@jb51.net" }
],
people2: [
{ firstName: "Brett", lastName:"McLaughlin", email: "brett@jb51.net" },
{ firstName: "Jason", lastName:"Hunter", email: "jb51.net" },
{ firstName: "Elliotte", lastName:"Harold", emai": "elharo@jb51.net" }
],
people3: [
{ firstName: "Brett", lastName:"McLaughlin", email: "brett@jb51.net" },
{ firstName: "Jason", lastName:"Hunter", email: "jb51.net" },
{ firstName: "Elliotte", lastName:"Harold", emai": "elharo@jb51.net" }
]
}

2.后台传输进来的满足JSON条件的文本格式化 。
因为JSON最大的用途是AJAX应用，因此关键是怎样把文本转换成javascript对象，假设我们请求回的文本为data，那么我们如下解析：
复制代码 代码如下:

data=data.replace(/\n | \r/g,"");
var obj=eval((+data+));

因为我们后台输出的时候会把空格和回车符也输出，因此这里要用正则替换掉，然后用eval转换成对象就可以调用了 。