JS function类型

函数的声明

    //常规
    function box1(n1, n2) {
        return n1 + n2;
    }
    console.log(box1(1, 2));
    //变量方式
    var box2 = function(n1, n2) {
        return n1 + n2;
    }
    console.log(box2(1, 2));
    //构造方式
    var box3 = new Function('n1', 'n2', 'return n1+n2');
    console.log(box3(1, 2))