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javascript遍历json对象的key和任意js对象属性实例

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:

javascript遍历json对象的key和任意js对象属性实例

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:

javascript遍历json对象的key和任意js对象属性实例

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:

javascript遍历json对象的key和任意js对象属性实例

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