方法Object()里面传参数和不传参数有什么区别？

Question

比如这里target = Object(target)和target = Object()或者target = new Object()有什么区别？if (typeof Object.assign != 'function') {  Object.assign = function(target) {    'use strict';    if (target == null) {      throw new TypeError('Cannot convert undefined or null to object');    }    target = Object(target);    for (var index = 1; index < arguments.length; index++) {      var source = arguments[index];      if (source != null) {        for (var key in source) {          if (Object.prototype.hasOwnProperty.call(source, key)) {            target[key] = source[key];          }        }      }    }    return target;  };}