Object.getOwnPropertyNames()方法返回直接在给定对象上找到的所有属性的数组(使用符号的那些不可枚举的属性除外)。
Object.getOwnPropertyNames(obj)
obj :这是要返回其可枚举和不可枚举自身属性的对象。
此方法返回一个字符串数组,该字符串数组对应于直接在对象上找到的属性。
Chrome | 5 |
Edge | 是 |
Firefox | 4 |
Opera | 12 |
const object1 = { a: 0, b: 1, c: 2, }; console.log(Object.getOwnPropertyNames(object1));
输出:
["a", "b", "c"]
var obj = { 0: 'a', 1: 'b', 2: 'c' }; console.log(Object.getOwnPropertyNames(obj).sort());//logs '0,1,2' // Logging property names and values using Array.forEach Object.getOwnPropertyNames(obj).forEach(function(val, idx, array) { console.log(val + ' -> ' + obj[val]); });
输出:
["0", "1", "2"] "0 -> a" "1 -> b" "2 -> c"
function Pasta(grain, size, shape) { this.grain = grain; this.size = size; this.shape = shape; } var spaghetti = new Pasta("wheat", 2, "circle"); var names = Object.getOwnPropertyNames(spaghetti).filter(CheckKey); document.write(names); //Check whether the first character of a string is 's'. function CheckKey(value) { var firstChar = value.substr(0, 1); if (firstChar.toLowerCase() == 's') return true; else return false; }
输出:
size,shape
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