正则验证问题，6-16位字母或数字
只能是 字母+数字 还是 字母 还是 数字 ?
/[0-9]/ //数字
/[a-zA-Z]/ //字母
/[a-z0-9]/ //数字+字母
/[a-z0-9]{6,16}/
允许纯字母或数字串
/^[a-z0-9]{6,16}$/
必须同时含有字母和数字
/^(?=.{6,16})(?=.*[a-z])(?=.*[0-9])[0-9a-z]*$/
只能是 字母+数字 还是 字母 还是 数字 ?
/^[a-z0-9]{6,16}$/i
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