for ... of循环和for ... in循环的区别
2017-07-03 09:56
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for … of循环它只循环集合本身的元素:
for … in循环遍历的是Array对象中的属性值
var a = ['A', 'B', 'C']; a.name = 'Hello'; for (var x of a) { alert(x); // 'A', 'B', 'C' }
for … in循环遍历的是Array对象中的属性值
var a = ['A', 'B', 'C']; a.name = 'Hello'; for (var x in a) { alert(x); // '0', '1', '2', 'name' }
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