记住密码功能 JS结合JQuery 操作 Cookie 实现记住密码和用户名！

// 记住密码功能 JS结合JQuery 操作 Cookie 实现记住密码和用户名！


var username = document.getElementById("username");
var password = document.getElementById("password");
var date=new Date(); 
var expiresDays=1000;  //过期时间。
date.setTime(date.getTime()+expiresDays*24*3600*1000); 
var str_in;
var str_out = ""; 
var num_in;
var num_out = "";

//加密
function str_to_num(val) {
    num_out = "";
    //if(form.input.value == "") alert(e);
    //else {
    str_in = escape(val);
    for(i = 0; i < str_in.length; i++) {
    num_out += str_in.charCodeAt(i) - 23;
    }
    //form.output.value = num_out;
    //form.input.value = "";
    return num_out;
}

//解密
function num_to_str(val) {
    str_out = "";
    num_out = val;  
    for(i = 0; i < num_out.length; i += 2) {
    num_in = parseInt(num_out.substr(i,[2])) + 23;
    num_in = unescape('%' + num_in.toString(16));
    str_out += num_in;
    }
    var str_out_jm = unescape(str_out);
    return str_out_jm ;
}
$(function(){
    $(".data_sub.sub_click").click(function(){
        if(document.getElementById("checkBox").checked){
            document.cookie = "a="+ str_to_num(username.value)+"; expires=" + date.toGMTString(); 
;
            document.cookie = "b="+ str_to_num(password.value)+"; expires=" + date.toGMTString();
        }else{
            return;
        }
    });
    var user = getCookie("a");
    var pass = getCookie("b");
    if(username.value == "")
    {
        username.value = num_to_str(user);
    }
    if(password.value == ""){
        password.value = num_to_str(pass);
    }
    });
});

function getCookie(name){ 
    var strCookie=document.cookie; 
    var arrCookie=strCookie.split("; "); 
    for(var i=0;i<arrCookie.length;i++){ 
        var arr=arrCookie[i].split("="); 
        if(arr[0]==name)return arr[1]; 
    } 
    return ""; 
}