var checkRegisterForm = function () {
var user_name=document.getElementById("username");
var pass_word=document.getElementById("password");
var pass_word_2=document.getElementById("password-2");
var re_user_name=/^[0-9a-zA-Z]{3,10}$/;
if (re_user_name.test(user_name.value)===false) {alert("用户名必须是3-10位英文字母或数字!");return false;}
else if (pass_word.value.length<6 || pass_word.value.length> 20) {alert("口令必须是6-20位!");return false;}
else if (pass_word_2.value!=pass_word.value) {alert("两次输入口令必须一致!");return false;}
else return true;
}
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