如何获取对象的实例名称 [英] How to get the instance name of an object
本文介绍了如何获取对象的实例名称的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用下面的代码来编写代码来在指定的时间间隔内查询web方法。
现在在this.Poll函数中我必须做
I use the below code to write code to query a web method in a specified interval.
now in the this.Poll function I have to do
this.tmo = setTimeout(this.strInstanceName + ".Poll()", this.iInterval);
而不是
this.tmo = setTimeout(this.Poll(), this.iInterval);
因为IE在setTimeout后丢失了this指针
我必须传递类的实例名称：
because IE looses the this pointer after setTimeout
So I have to pass the class it's instance name:
var objPoll = new cPoll("objPoll");
如何获取实例名称而不将其作为参数传递？
我想要它在那里！
How can I get the instance name without passing it as parameter ?
I want to have it outta there !
<!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>
<title>Intervall-Test</title>
<script type="text/javascript" language="javascript">
function test()
{
alert("Test");
test.tmo = setTimeout(test, 2000);
test.Clear = function()
{
clearTimeout(test.tmo);
}
}
function cPoll(strInstanceName)
{
this.strInstanceName = strInstanceName ;
this.iInterval = 2000;
this.tmo=null;
this.cbFunction=null;
this.Poll = function()
{
this.cbFunction();
this.tmo = setTimeout(this.strInstanceName + ".Poll()", this.iInterval);
}
this.Start = function(pCallBackFunction, iIntervalParameter)
{
if(this.tmo != null)
this.Stop();
if(iIntervalParameter && iIntervalParameter > 0)
this.iInterval=iIntervalParameter;
this.cbFunction=pCallBackFunction;
if(this.cbFunction!=null)
this.Poll();
else
alert("Invalid or no callback function specified");
}
this.Stop = function()
{
if(this.tmo != null)
{
clearTimeout(this.tmo);
this.tmo=null;
}
}
}
function CallBackFunction()
{
alert("PollCallBack");
}
// test();
// test.Clear();
var objPoll = new cPoll("objPoll");
</script>
</head>
<body>
<h1>Test</h1>
<input type="Button" value="Start polling" onclick="objPoll.Start(CallBackFunction,3000);" />
<input type="Button" value="Stop polling" onclick="objPoll.Stop();" />
</body>
</html>
推荐答案
我问过另一个问题， ：
I've asked another question, the answer is here:
遍历全局变量并检查它是否等于this。
Iterating through the global variables and check whether it equals "this".
这篇关于如何获取对象的实例名称的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
