jsN位字母数字混合验证码

Posted 2020-12-11 Cupid

n位字母数字混合验证码

 function testcode(n){
                var arr= []
                for( var i = 0;i < n; i++){
                    var num =parseInt(Math.random()*123)
                    if( num >0 && num < 9){
                        arr.unshift(n)
                    }else if(num >= 65 && num <= 90 || num >= 97 && num <= 122){
                        arr.unshift(String.fromCharCode(num))
                    }else{
                        i--
                    }
                }
                return arr.join("")
            }
          console.log(testcode(4))