转载：http://www.verydemo.com/demo_c98_i48246.html
/**
* 去除字符串前后的空格
* 使用方法: str.trim();
* @return string
*/
String.prototype.trim = function()
{
// 用正则表达式将前后空格
// 用空字符串替代。
return this.replace(/(^/s*)|(/s*$)| /g, "");
}
/**
* 精确统计字符串字节数
*
* return integer
*/
String.prototype.ByteCount = function(trim)
{
txt = this.replace(/(<.*?>)/ig,'');
if(trim == true)txt = this.replace(/[/s/t/r/n]/g, '');
txt = txt.replace(/([/u0391-/uFFE5])/ig, '11');
var count = txt.length;
return count;
}
//双字节字符截取
String.prototype.cn_substr = function(start, len, replace)
{
var s = this.replace(/([/u4e00-/u9fa5])/g,"/xff/$1");
if(s.length > len)
{
if(s.length == this.length)return this.substring(start, len);
return (s.substring(start, len).replace(//xff/g, '') + replace);
}
return this;
//return s.substring(start, len).replace(//xff/g, '');
}
var p$ = function(objName)
{
if(parent.document.getElementById)
{
return eval('parent.document.getElementById("'+objName+'")');
}
else
{
return eval('parent.document.all.'+objName);
}
}
function $id(id)
{
return document.getElementById(id);
}
function $tag(name, obj)
{
if(typeof(obj) == "undefined")
{
obj = document;
}
return obj.getElementsByTagName(name);
}
function getFrameNode(sNode)
{
return document.frames ? document.frames[sNode] : document.getElementById(sNode).contentWindow;
}
....................................................................
function is_mod(num, mod_num)
{
if((num % mod_num) == 0)
{
return true;
}
return false;
}
function is_float(str, nozero)
{
if(!nozero)
{
var reg = /^[0-9]/d*(./d+)?$/;
}
else
{
var reg = /^[1-9]/d*(./d+)?$/;
}
return reg.test(str);
}
function str_line(str, len)//超长连续字符按长度在后面加空格，防止撑开页面
{
var l = str.ByteCount();
if(l <= len)
{
return str;
}
var s = new Array();
while(l > len)
{
var tmp = str.cn_substr(0, len, "");
s.push(tmp);
var n = tmp.ByteCount();
str = str.cn_substr(n, l, "");
l = l - n;
}
s.push(str);
str = s.join(" ");
return str;
}
function create_js(id, src)
{
var js = document.getElementById(id);
if (js != null && js.tagName.toLowerCase() == "script")
{
document.getElementsByTagName("head").item(0).removeChild(js);
}
src += "&_t=" + new Date().getTime();
js = document.createElement('script');
js.id = id;
js.src = src;
document.getElementsByTagName("head").item(0).appendChild(js);
}
function checkCount(name, checked, obj)
{
var e = $tag("INPUT", obj);
var count = 0;
for(var i = 0; i < e.length; i++)
{
if(e[i].name == name && e[i].checked == checked)
{
count++;
}
}
return count;
}
function class_ajax()
{
this.ID = "ajax";
/**
* xml请求对象
*/
this.xmlHttp = null;
/*
* 请求的目标url
*/
this.url = "";
/**
* http请求的方法 GET or POST
*/
this.method = "";
/**
* 状态改变的事件触发函数
*/
this.event = "";
/**
* 是否为异步连接
*/
this.async = true;
/**
* REQUEST参数
*/
this.params = new Array;
/**
* 初始化xmlHttpRequest对象
*
*/
this.init = function()
{
if(this.xmlHttp == null)
{
if (window.XMLHttpRequest)
{
this.xmlHttp = new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
this.xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
if(!this.xmlHttp)
{
this.xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
}
}
}
if(this.xmlHttp == null)
{
alert("invalid xmlHttpRequest!");
return false;
}
}//end function
/**
* 设置目标请求方法
*/
this.set_method = function(method)
{
if(method != 'POST' && method != 'GET')
{
alert("invalid method!");
return false;
}
this.method = method;
}//end function
/**
* 获取目标请求方法
*/
this.get_method = function()
{
return this.method;
}//end function
/**
* 设置状态该表要触发的事件
*/
this.set_event = function(event)
{
this.event = event;
}//end function
/**
* 获取 event
*/
this.get_event = function()
{
return this.event;
}//end function
/**
* 设置要请求的目标url
*/
this.set_url = function(url)
{
this.url = url;
}//end function
/**
* 获取 url
*/
this.get_url = function()
{
return this.url;
}//end function
/**
* 添加REQUEST 参数
*/
this.add_param = function(key, val)
{
var tmpCount = this.params.length;
this.params[tmpCount] = key + "=" + val;
}//end function
/**
* 设置请求为异步连接
*/
this.set_async = function()
{
this.async = true;
}//end function
/**
* 取消异步连接，即设置为同步连接
*/
this.set_sync = function()
{
this.async = false;
}//end function
/**
* 发送请求
*/
this.submit = function()
{
this.xmlHttp.onreadystatechange = this.event;
var send_params = null;
if(this.params.length > 0)
{
send_params = this.params.join('&');
if(this.method == 'POST')
{
this.xmlHttp.open(this.method, this.url, this.async);
//this.xmlHttp.setRequestHeader("Method", this.method + this.url + " HTTP/1.1");
this.xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
this.xmlHttp.send(send_params);
}else
{
this.xmlHttp.open(this.method, this.url + "?" + send_params, this.async);
this.xmlHttp.send(null);
}
}else
{
this.xmlHttp.open(this.method, this.url, this.async);
this.xmlHttp.send(send_params);
}
}//end function
/**
* return Data
* @param string type : "xml" or "text"
*/
this.get_content = function(type)
{
if(type == 'xml')
{
return this.xmlHttp.responseXML.documentElement;
}else
{
return this.xmlHttp.responseText;
}
}
/**
* 检测事件是否完成
*/
this.complete = function()
{
if(this.xmlHttp.readyState == 4)
{
return true;
}
return false;
}//end function
/*
* 检测请求是否成功
*/
this.success = function()
{
if (this.complete() && this.xmlHttp.status == 200) {
return true;
}
return false;
}//end function
/**
* 获取消息提示
*/
this.get_statusText = function()
{
return this.xmlHttp.statusText;
}//end function
}//end class
ajax类实例
var Ajax = new class_ajax();
Ajax.ID = "buyTools";
Ajax.init();
Ajax.set_method("POST");
Ajax.set_event(Guess.buyToolsCallBack); //参数不能加引号
Ajax.set_url("/iframe/guess_srv.php?action=buy_tools");
Ajax.add_param("single", single);
Ajax.add_param("group", group);
Ajax.add_param("_t", new Date().getTime());
Ajax.submit();