1-预编译习题的讲解

1 创建AO对象

2 找形参和变量的声明，作为AO对象的属性名，值是undefined

3 实参和形参相统一

4 找函数声明，覆盖变量的声明

function fn(a,c){
    console.log(a)//function a(){}
    var a=123;// a=123
    console.log(a);//123
    console.log(c);//function c(){}
    function a(){
        
    }
    console.log(d)//undefined
    console.log(b)//undefined
    var b=function(){
        
    }
    console.log(b)//function(){}
    function c(){}
    console.log(c)//function c(){}
}
fn(1,2);

 AO：{

a:undefined 1 function a(){}

b:undefined function(){}

c:undefined 2 function c(){}

d:undefined

}

 

标签：function,console,log,AO,编译,123,讲解,习题,undefined
来源： https://blog.csdn.net/weixin_50464014/article/details/120643649