function regx(r,s){//验证正则表达式是否对的方法
	if (r == null || r == ""){
		return false;
	}
	var patrn= new RegExp(r);
	if (patrn.exec(s))
		return true
	return false
}
var codeLength = 6;//随机数的长度（与正则表达式中的{6}相对应）
var chars = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];//正则表达式的随机数
var code = "/";//随机数的前缀
var regxRule = "/[A-Za-z0-9]{6}";//需要验证的正则
//循环获取随机数
for(let i = 0;i<codeLength;i++){
	var charIndex = Math.floor(Math.random()*chars.length);
	code+= chars [charIndex]
}
console.log(code);
//验证生成的随机数是否正确
regx(regxRule,code);