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超轻量级php框架startmvc

javascript遍历json对象的key和任意js对象属性实例

更新时间:2020-04-28 13:10:01 作者:startmvc
使用keys方法获取该对象的属性和方法:functionPasta(grain,width,shape){this.grain=grain;this.width=width;t

使用 keys 方法获取该对象的属性和方法:


 function Pasta(grain, width, shape) {
 this.grain = grain;
 this.width = width;
 this.shape = shape;
 this.toString = function () {
 return (this.grain + ", " + this.width + ", " + this.shape);
 }
 }
 
 var spaghetti = new Pasta("wheat", 0.2, "circle");
 var arr = Object.keys(spaghetti);
 document.write(arr);

结果图:

显示 Pasta 对象中以字母“g”开头的所有可枚举属性的名称:


function Pasta(grain, width, shape) {
 this.grain = grain;
 this.width = width;
 this.shape = shape;
 }

 function CheckKey(value) {
 var firstChar = value.substr(0, 1);
 if (firstChar.toLowerCase() == "g") {
 return true;
 } else {
 return false;
 }
 }

 var polenta = new Pasta("corn", 1, "mush");
 var keys = Object.keys(polenta).filter(CheckKey);
 document.write(keys);

结果如图:

遍历json对象的键:


var an_obj = { 100: 'a', 2: 'b', 7: 'c', "name": "wu", "interesting": "Game" };
 document.write(Object.keys(an_obj));

结果如图:

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javascript json 遍历