Object.prototype.__count__

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已废弃 Gecko 2 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1)
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

 __count__ 属性曾经用来存放对象的可枚举的属性的个数,但是已经被废除。

语法

obj.__count__

示例

{ 1: 1 }.__count__              // 1
[].__count__                    // 0
[1].__count__                   // 1
[1, /* hole */, 2, 3].__count__ // 3

详细说明

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