How to use cookies to record user names in js_javascript skills-JS Tutorial-php.cn

How to use cookies to record user names in js_javascript skills

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Release： 2016-05-16 15:29:36

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The example in this article describes how js uses cookies to record user names. Share it with everyone for your reference, the details are as follows:

Cookie idea: When you click the login button, save the cookie, and read the cookie when you visit again, that is, just save the cookie value before setting the txt value.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
function setCookie(name, value, iDay)
{
  var oDate=new Date();
  oDate.setDate(oDate.getDate()+iDay); //用来设置过期时间用的，获取当前时间加上传进来的iDay就是过期时间
  document.cookie=name+'='+value+';expires='+oDate;
};
function getCookie(name)
{
  var arr=document.cookie.split('; '); //多个cookie值是以; 分隔的，用split把cookie分割开并赋值给数组
  for(var i=0;i<arr[i].length;i++) //历遍数组
  {
    var arr2=arr[i].split('='); //原来割好的数组是：user=simon，再用split('=')分割成：user simon 这样可以通过arr2[0] arr2[1]来分别获取user和simon 
    if(arr2[0]==name) //如果数组的属性名等于传进来的name
    {
      return arr2[1]; //就返回属性名对应的值
    }
    return ''; //没找到就返回空
  }
};
function removeCookie(name)
{
  setCookie(name, 1, -1); //-1就是告诉系统已经过期，系统就会立刻去删除cookie
};
window.onload=function()
{
  var form=document.getElementById('form');
  var user=document.getElementsByName('user')[0];
  form.onsubmit=function()
  {
    setCookie('user', user.value, 14);
  };
  user.value=getCookie('user');
};
</script>
</head>
<body>
<form action="" id="form">
  用户名：<input type="text" name="user" /><br />
  密码：<input type="password" name="pass" /><br />
  <input type="submit" value="登录" />
</form>
</body>
</html>

Copy after login

I hope this article will be helpful to everyone in JavaScript programming.