function get(n){
var arr = [];
while(arr.length <n){
var num = Math.floor(Math.random()*10);
if(arr.indexOf(num) == -1){
arr.push(num)
}
}
return arr.join('')
}
console.log(get(4))
function get(n){
var arr = [];
while(arr.length <n){
var num = Math.floor(Math.random()*10);
if(arr.indexOf(num) == -1){
arr.push(num)
}
}
return arr.join('')
}
console.log(get(4))本文标题：随机4位不重复验证码
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