您需要jQuery，因此只需使用它：
function extend() { var options, name, src, copy, copyIsArray, clone, target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, toString = Object.prototype.toString, hasOwn = Object.prototype.hasOwnProperty, push = Array.prototype.push, slice = Array.prototype.slice, trim = String.prototype.trim, indexOf = Array.prototype.indexOf, class2type = { "[object Boolean]": "boolean", "[object Number]": "number", "[object String]": "string", "[object Function]": "function", "[object Array]": "array", "[object Date]": "date", "[object RegExp]": "regexp", "[object Object]": "object" }, jQuery = { isFunction: function (obj) { return jQuery.type(obj) === "function" }, isArray: Array.isArray || function (obj) { return jQuery.type(obj) === "array" }, isWindow: function (obj) { return obj != null && obj == obj.window }, isNumeric: function (obj) { return !isNaN(parseFloat(obj)) && isFinite(obj) }, type: function (obj) { return obj == null ? String(obj) : class2type[toString.call(obj)] || "object" }, isPlainObject: function (obj) { if (!obj || jQuery.type(obj) !== "object" || obj.nodeType) { return false } try { if (obj.constructor && !hasOwn.call(obj, "constructor") && !hasOwn.call(obj.constructor.prototype, "isPrototypeOf")) { return false } } catch (e) { return false } var key; for (key in obj) {} return key === undefined || hasOwn.call(obj, key) } }; if (typeof target === "boolean") { deep = target; target = arguments[1] || {}; i = 2; } if (typeof target !== "object" && !jQuery.isFunction(target)) { target = {} } if (length === i) { target = this; --i; } for (i; i < length; i++) { if ((options = arguments[i]) != null) { for (name in options) { src = target[name]; copy = options[name]; if (target === copy) { continue } if (deep && copy && (jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)))) { if (copyIsArray) { copyIsArray = false; clone = src && jQuery.isArray(src) ? src : [] } else { clone = src && jQuery.isPlainObject(src) ? src : {}; } // WARNING: RECURSION target[name] = extend(deep, clone, copy); } else if (copy !== undefined) { target[name] = copy; } } } } return target; }并进行了一次小型测试，证明它可以进行深层复制
extend(true, { "name": "value" }, { "object": "value", "other": "thing", "inception": { "deeper": "deeper", "inception": { "deeper": "deeper", "inception": { "deeper": "deeper" } } } })但请记住提供出处：https :
//github.com/jquery/jquery/blob/master/src/core.js
