js随机生成指定长度字符串

function randomStr(n=0){
        var str = 'zxcvbnmasdfghjklqwertyuiopZXCVBNMASDFGHJKLQWERTYUIOP1234567890'
        var temp = ''
        k = str.length
        for(var i=0;i<n;i++){

            //生成不大于str长度的随机数
            temp += str.charAt(Math.floor(Math.random() * k))
        }
        return temp
    }
    console.log(randomStr(10));