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liunian/gist:5676234

Created May 30, 2013 07:24
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jquery 和 underscore 式的构造器，有无 new 都会进行创建，传入已创建的对象会直接返回
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gistfile1.js
var _ = function(obj) {
if (obj instanceof _) return obj;
if (!(this instanceof _)) return new _(obj);
this._wrapped = obj;
};
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