前端试题 一

//公共js
function log(){
    console.log(...arguments);
}

//1
log([]+[]+'f00'.split(''));//f,0,0

//2
log(new Array(5).toString());//,,,,

//3
log((true+false)>2+true);//false

//true+false=1
//2+true=3

//4
var num4=function Fn4(){
    log(typeof Fn4)
}
num4();//function
log(typeof Fn4);//undefined

//5
var num5=1;
if (function Fn5(){}) {
    num5+=typeof Fn5;
}
log(num5);//1undefined

//6
function fun(n,o){
    log(o);
    return {
        fun:function(m){
            return fun(m,n);
        }
    }
}
var fn1=fun(0);
    fn1.fun(1);
    fn1.fun(2);//undefined,0,0
var fn2=fun(0).fun(1).fun(2);//undefined,0,1

var fn3=fun(0).fun(1);
    fn3.fun(2);
    fn3.fun(3);//undefined,0,0,0

//7
var fn7;
log(typeof fn7);  //function
function fn7(x){
    return x*2
}
var fn7;
  log(typeof fn7);  //function
var fn7=1;
  log(typeof fn7);  //number

//函数优先级大于变量优先级

//8
var x=2,y=1;
function fn8(){
    var x=3;
    return {
        x:x,
        fn:function(a,b){
            x=a+b;
        }
    }
}
var num8=fn8();
    num8.fn(4,4);
    log(num8.x,x)
//答案：3,2

//9
var a=0,b=0;
function A(a){
    A=function(b){
        log(a+b++)
    }
    log(a++)
}
A(1);//1,将A赋值新的函数,a++:先输出a，再对a+1
A(2);//4,

//10

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