獲取對象鍵數(shù)組我希望在jQuery或純JavaScript中將JavaScript對象的鍵作為數(shù)組。有比這更少的方式嗎？var foo = { 'alpha' : 'puffin', 'beta' : 'beagle' };var keys = [];for (var key in foo) {
keys.push(key);}
3 回答
梵蒂岡之花
TA貢獻(xiàn)1900條經(jīng)驗(yàn) 獲得超5個(gè)贊
Object.keys:
var foo = {
'alpha': 'puffin',
'beta': 'beagle'
};
var keys = Object.keys(foo);
console.log(keys) // ['alpha', 'beta']
// (or maybe some other order, keys are unordered).
Object.keys
躍然一笑
TA貢獻(xiàn)1826條經(jīng)驗(yàn) 獲得超6個(gè)贊
Object.keys()Object.keys()
var foo = { 'alpha' : 'puffin', 'beta' : 'beagle' };var keys = [];for (var key in foo) {
keys.push(key);}var foo = { 'alpha' : 'puffin', 'beta' : 'beagle' };var keys = [], i = 0;for (keys[i++] in foo) {}Object.keys()
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