How to prevent library functions from being accidentally modified incorrectly

When a function reads an inherited object, it actually reads the inherited value. If you assign values ​​to the properties of an inherited object, these properties will only affect the inherited object itself, not the original object

//inherit()返回了一个继承自原型对象p的属性的新对象
        //这里使用ECMAScript 5中的Object.create()函数（如果可用）
        //如果不可用，则使用其它方法
        function inherit(p) {
            if (p == null) throw TypeError();  //p是一个对象，但不能是null
            if (Object.create)            //如果Object.create()存在
                return Object.create(p);  //直接使用
            var t = typeof p;             //否则进一步检验
            if (t !== "object" && t !== "function") throw TypeError();  
            function f() { }; //定义一个空构造函数
            f.prototype = p; //将其原型属性设置未p
            return new f();  //使用f()创建p的继承对象
        }

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