Non-enumerable
The method or property will not be enumerated in a for/in loop.
By default, methods are not enumerated.
Event handlers are also not enumerated in Netscape. 没啥好解释滴,js 滴默认不能枚举方法!
The method or property will not be enumerated in a for/in loop.
By default, methods are not enumerated.
Event handlers are also not enumerated in Netscape. 没啥好解释滴,js 滴默认不能枚举方法!
for(i=0;i<a.length;i++)
document.write(a[i]+" ")//啥都没
for(var i in a)
document.write(a[i]+" ")//啥都没