简明json介绍

在JS中我们可以直接定义一个对象：

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：

{ firstName: "Brett", lastName:"McLaughlin", email: "[e-mail]" }

{ people: [ 
{ firstName: "Brett", lastName:"McLaughlin", email: "[e-mail]" }, 
{ firstName: "Jason", lastName:"Hunter", email: "3water.com" }, 
{ firstName: "Elliotte", lastName:"Harold", emai": "[e-mail]" } 
]} 
{ people1: [ 
{ firstName: "Brett", lastName:"McLaughlin", email: "[e-mail]" }, 
{ firstName: "Jason", lastName:"Hunter", email: "3water.com" }, 
{ firstName: "Elliotte", lastName:"Harold", emai": "[e-mail]" } 
], 
people2: [ 
{ firstName: "Brett", lastName:"McLaughlin", email: "[e-mail]" }, 
{ firstName: "Jason", lastName:"Hunter", email: "3water.com" }, 
{ firstName: "Elliotte", lastName:"Harold", emai": "[e-mail]" } 
], 
people3: [ 
{ firstName: "Brett", lastName:"McLaughlin", email: "[e-mail]" }, 
{ firstName: "Jason", lastName:"Hunter", email: "3water.com" }, 
{ firstName: "Elliotte", lastName:"Harold", emai": "[e-mail]" } 
] 
}

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：

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。