SOURCE

var outerT = function(left, right) {
    console.log(this);
    return left + right;
}

var handler = {
    apply: function(target, ctx, args) {
        // 第一个参数为目标对象，这里通过Reflect.apply把上次处理的结果传递给被代理执行
        return Reflect.apply(...arguments) * 2;
    }
}

var p = new Proxy(outerT, handler);
debugger
console.log(p.apply({name: 'qinliang'}, [2, 3]));
console.log(p(2, 3));
console.log(Reflect.apply(p, null, [2, 3]));