给我写一个js的6为验证码

function generateCode() { var code = ""; var chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; for (var i = 0; i < 6; i++) { code += chars.charAt(Math.floor(Math.random() * chars.length)); } return code; }

console.log(generateCode()); // 输出一个6位随机验证码