实例详解JSON取值(key是中文或者数字)方式

var json = {'name':'zhangsan', '年龄':23, 404:'你可能迷路了'};

with(json) {  console.log(name);//输出:zhangsan  console.log(年龄);//输出:23  console.log(404);//输出:404,用这种方法读取key是数字的属性,有问题}

console.log(json.name);//输出:zhangsan//key是中文也是支持的console.log(json.年龄);//输出:23//key是Number类型或者String类型的数字都不能这么读取console.log(json.404);//报错

console.log(json['name']);/输出:zhangsanconsole.log(json['年龄']);//输出:23console.log(json['404']);//输出:你可能迷路了json[key]console.log(json[name]);/输出:undefindedconsole.log(json[年龄]);//报错console.log(json[404]);//输出:你可能迷路了

var jsonArr = [  {"id": "1", "name": "A1"},  {"id": "2", "name": "A2"},  {"id": "3", "name": "A3"},  {"id": "4", "name": "A4"},  {"id": "5", "name": "A5"}]

//创建一个查找表函数function createLookMap(field) {  var map = {};//创建一个空的json对象  for (var i = 0; i < jsonArr.length; i++) {    var value = jsonArr[i];//将数组中的元素作为json对象的值    var key = value[field];//选取一个属性作为新的json对象的key    map[key] = value;  }  return map;}