Question

javascript中json数组的取值问题

概念性的东西就不说了，我直接给个例子。
var test=[{"id":1,"name":'李'},{"id":2,"name":'张'},{'id':3,name:'刘'},{"id":4,"name":'wang'}]
我现在得到一个id=2，这么得到它相对应json对象里面的name,也就是怎么得到'张'

Answer 1

//构建一个json对象
var pinpai = {
"0":{"美的":49,"三星":35,"海信":25,"格力":16,"方太":14},
"1":{"美的":49,"三星":35,"海信":25,"格力":16,"方太":14}
}；
jiage = pinpai[0]['美的'];
源：
//构建一个json对象
var jb={"美的":49,"三星":35,"海信":25,"格力":16,"方太":14};
for(var key in jb){
alert(key); //json对象的key
alert(jb[key]); //json对象的值
}

Answer 2

var id = 2;
var name = "";
var index = test.findIndex((v,i)=>v.id == id);
if(index >= 0)
    name = test[index].name;