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浏览器兼容性之原生方法
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| var | |
| nativeIsArray = Array.isArray, | |
| nativeKeys = Object.keys, | |
| nativeBind = FuncProto.bind; |
不过好在underscore提供了具有兼容性的_.isArray方法
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不是所有浏览器都支持以下js原生方法，ECMAScript 5才有哦，IE9以下就不支持。