js鸭式辨型

1.鸭式辨型的核心监测接口里的方法是否被实现类都实现

<script type="application/javascript">

    /**
     * 定义接口类
     * @param name  接口名称
     * @param methods   方法数组
     * @constructor
     */
    var Interface = function (name, methods) {
        if (arguments.length != 2) {
            return;
        }
        this.name = name;
        this.methods = [];
        for (var i = 0, len = methods.length; i < len; i++) {
            if (typeof methods[i] != 'string') {
                return;
            }
            this.methods.push(methods[i]);
        }
    };

    /**
     * 实现类
     */
    var MyInterfaceImpl = function () {

    };

    MyInterfaceImpl.prototype.setName = function (name) {
        this.name = name;
        console.log(name);
    };

    MyInterfaceImpl.prototype.getName = function () {
        console.log(this.name);
    };
    
    /**
     * 检测接口里面的方法
     * @param obj
     */
    Interface.ensureImplements = function (obj) {
        if (arguments.length < 2) {
            throw new Error('最少传递两个参数');
        }
        // 获取接口实现方法
        for (var i = 1; i < arguments.length; i++) {
            var instanceInterface = arguments[i];
            if (instanceInterface.constructor != Interface) {
                return;
            }
            // 循环接口的每个方法
            for (var j = 0, len = instanceInterface.methods.length; j < len; j++) {
                var methodName = instanceInterface.methods[j];
                if (!obj[methodName] || typeof obj[methodName] != 'function') {
                    return;
                }
            }
        }
    };

    var c1 = new MyInterfaceImpl('MyInterfaceImpl', ['setName', 'getName']);
    c1.setName('测试');
    c1.getName();
</script>