写页面的时候一直没整明白为什么吗对象格式的要通过JSON.stringify（）这个方法转一下有什么好处，最近看其它的博客get到一些实用的技巧
第一种：在数组中提取数据
var data = [{name: "程咬金",sex: "1",age: 26},{name: "程才",sex: "0",age: 20},{name: "程新松",sex: "1",age: 22},{name: "程功",sex: "1",age: 18}];如果这里我们只想提取name 和 sex我们常用的方法可能是var new_data = JSON.stringify(data,['name','sex']);console.log(new_data);输出结果[{"name":"程咬金","sex":"1"},{"name":"程才","sex":"0"},{"name":"程新松","sex":"1"},{"name":"程功","sex":"1"}]
第二种用法：修改数据
例如我们要把sex为0改为女 sex为1改为男
var str_json = JSON.stringify(data,function(key,value){if(key == 'sex'){return ["女",'男'][value];}return value;});console.log(str_json);输出结果[{"name":"程咬金","sex":"男","age":26},{"name":"程才","sex":"女","age":20},{"name":"程新松","sex":"男","age":22},{"name":"程功","sex":"男","age":18}]value的值是data中对象sex的值，而这个['女','男']数组，是根据[value]的索引对应到[‘女’,‘男’]，也就是说当value为0，[value]即为[0],对应到数组['女','男']的索引0，值即为‘女’。比如我定义8--男，9--女；var data =[{name: "程咬金",sex:"8",age:26 },{name: "程才",sex:"9",age:20},{name: "程新松",sex:"8",age:22 },{name: "程功",sex:"8",age:18 }];/*回调函数做一个映射关系*/var str_json = JSON.stringify(data,function(key,value){if(key == 'sex'){return ['男','女'][value-8];}return value;});console.log(str_json);
