函数作用域
var a=2;
function foo(){
var a=3;
console.log(a,"函数");
}
foo();//3,"函数"
console.log(a);//2
var 与 let
var a = '1'
a= '2'
console.log(a,"a")
const a = '1'
a= '2'
console.log(a,"a")
微信扫一扫
函数作用域
var a=2;
function foo(){
var a=3;
console.log(a,"函数");
}
foo();//3,"函数"
console.log(a);//2
var 与 let
var a = '1'
a= '2'
console.log(a,"a")
const a = '1'
a= '2'
console.log(a,"a")
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