javascript遍历json对象的key和任意js对象属性实例

 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);

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);

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