js從Cookies裡面取值的簡單實現
編輯：關於JavaScript
工作過程中遇到一個Js從Cookies裡面取值的需求，Js貌似沒有現成的方法可以指定Key值獲取Cookie裡面對應的值，參閱網上的代碼，簡單實現如下：
1. 服務端代碼，Page_Load裡面Cookies寫入幾個值
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication_TestJS
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.Cookies["DONO"].Value = "EDO1406300001";
Response.Cookies["DOID"].Value = "ABCDEFG123456";
Response.Cookies["DOSOURCE"].Value = "WUWUWUWU";
Response.Cookies["DOTYPE"].Value = "2";
}
}
}
2. 客戶端代碼，頁面添加按鈕和文本框，用於觸發和輸出獲取到的值
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication_TestJS._Default" %>
<html>
<script language="javascript" type="text/javascript">
function GetCookie()
{
/*獲取Cookies裡面存放信息 了解其字符串結構*/
var Cookies = document.cookie;
document.getElementById("<%=txtContent.ClientID%>").innerText = Cookies;
/*處理字符串截取出來需要的目標值*/
var target = "DONO" + "=";
if (document.cookie.length > 0)
{
start = document.cookie.indexOf(target);
if (start != -1)
{
start += target.length;
end = document.cookie.indexOf(";", start);
if (end == -1) end = document.cookie.length;
}
}
/*目標值賦值給控件*/
document.getElementById("<%=txtTarget.ClientID%>").innerText = document.cookie.substring(start, end);
}
</script>
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="btnGetReq" runat="server" Text="獲取內容" OnClientClick="GetCookie()" />
<br />
<asp:TextBox ID="txtContent" runat="server" Columns="120"></asp:TextBox>
<br />
<asp:TextBox ID="txtTarget" runat="server" Columns="120"></asp:TextBox>
</div>
</form>
</body>
</html>
3.執行結果，可以看到Cookies就是如第一個文本框中存放結構，根據需要截取相應字符串即可
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