JavaScript权威指南上有这么一段代码,结果比较让人迷惑,求分析解答...var o = {x:1, y:2, z:3};
var a = [], i = 0
for(a[i++] in o);console.log(a); //['x', 'y', 'z']
javascript
var a = [], i = 0
for(a[i++] in o);console.log(a); //['x', 'y', 'z']
javascript
把 a[i++] 当做一个变量看 赋值 o 的key, i,从0~2 ,最后完成数组赋值