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if (!Function.prototype.softBind) {
  Function.prototype.softBind = function(obj) {
    var fn = this;
    // 捕获所有curried参数
    var curried = [].slice.call(arguments, 1);
    var bound = function() {
      return fn.apply(
        (!this || this === (window || global)) ? 
            obj : this,
        curried.concat.apply(curried, arguments)
      );
    };
    bound.prototype = Object.create(fn.prototype);
    return bound;
  }
}