Javascript实用技巧合集

1.判断浏览器的类型：

// 判断当前比较主流的浏览器 IE5，IE6，Chrome以及opera

function getBrowser(){
      var ver = navigator.appVersion;
      if(ver.indexOf("MSIE 5")!=-1){
           return "IE 5.0";
      }else if(ver.indexOf("MSIE 6")!=-1){
           return "IE 6.0";
      }else if(ver.indexOf("Chrome")!=-1){
           return "Google Chrome浏览器";
      }else if(window.opera){
           return "Opera 浏览器";
      }
      return ver;
}
document.write("你当前使用的浏览器为："+getBrowser());

 2.Javascript 读写Cookie的方法

 

function GetCookieVal(offset)
//获得Cookie解码后的值
{
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function SetCookie(name, value)
//设定Cookie值
{
var expdate = new Date();
var argv = SetCookie.arguments;
var argc = SetCookie.arguments.length;
var expires = (argc > 2) ? argv[2] : null;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));
document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))
+((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))
+((secure == true) ? "; secure" : "");
}
function DelCookie(name)
//删除Cookie
{
var exp = new Date();
exp.setTime (exp.getTime() - 1);
var cval = GetCookie (name);
document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
}
function GetCookie(name)
//获得Cookie的原始值
{
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen)
{
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return GetCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}

 3.运行代码：

function exeTextByElement(id){
      var script = document.getElementById(id).innerHTML;
      eval(script);
}

 

详情见页面：http://tntxia.web.ly25.com/mytutorial/tutorial-1.html

点击了“运行代码”按钮就会根据广本框的ID来运行文本框中的代码

 

4.JSON的使用

http://tntxia.web.ly25.com/mytutorial/tutorial-1/1.html