JSON.stringify常见用法

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var data =[
{
    name: "金",sex:"1",age:26    
},
{
    name: "才",sex:"0",age:20
},
{
    name: "松",sex:"1",age:22    
},
{
    name: "功",sex:"1",age:18    
}
];

//日常用法
console.log(data,'数组');var str_json = JSON.stringify(data);console.log(str_json,'字符串');

/*提取用户名和性别-方法1*/
for(var i=0,new_data=[];i<data.length;i++){    new_data.push({        name: data[i].name,        sex: data[i].sex    });}

var str_json = JSON.stringify(new_data);console.log(str_json);

/*提取用户名和性别-方法2*/
var str_json = JSON.stringify(data,["name","sex"]);console.log(str_json);

/*回调函数做一个映射关系*/
var str_json = JSON.stringify(data,function(key,value){
    if(key == 'sex'){
        return ['女','男'][value];
        /*该处注释等价于return ['女','男'][value];*/
        if(value == 0 ){            value = '女';        }else{            value = '男';        }
    }
    return value;
});
console.log(str_json);

/*格式化字符串*/
var str_json = JSON.stringify(data,null,'\t');console.log(str_json);var str_json = JSON.stringify(data,['name','sex'],'\t');console.log(str_json);