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:

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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