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原来点号不加转义是任意匹配，加了才是表征符号，和w、d是反的

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alienation

#1 Created at ... [Delete] [Delete and Lock User] 
    var re_name = /\w{3,10}/
    var re_password = /.{6,20}/
    var user_name = document.getElementById('username').value
    var password = document.getElementById('password').value
    var password2 = document.getElementById('password-2').value
    if (!re_name.test(user_name) || !re_password.test(password) || password !== password2){
        return false}
    return true}

alienation

#2 Created at ... [Delete] [Delete and Lock User]

加了提醒

    // TODO:
    var re_name = /\w{3,10}/
    var re_password = /.{6,20}/
    var user_name = document.getElementById('username').value
    var password = document.getElementById('password').value
    var password2 = document.getElementById('password-2').value
    if (!re_name.test(user_name)){
    alert('用户名为3-10以内的数字或英文字母')
    return false}
    if (!re_password.test(password)){
    alert('密码必须在6-20位以内')
    return false}
    if (password !== password2){
    alert('两次输入密码不一致')
    return false}
    return true}
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