JavaScript中出现意外的未定义错误

Question

I have page in which there's a function which calls a function from js file. 我有一个页面，其中有一个函数，该函数从js文件中调用一个函数。

the code which calls function in js file: 调用js文件中的函数的代码：

<script language="javascript" type="text/javascript">
var qc = qc_chat;
window.onload = function()
{
qc.setup('<?php echo $p; ?>');
}
</script>

I am including qc.js file using this code: 我使用以下代码包括qc.js文件：

function doThat() {
    $.ajax({
        url:    'http://www.example.com',
        type: 'GET',
        data: 'adrs='+getHost( document.domain ),
        dataType:   'jsonp',
        jsonp:  false,
        jsonpCallback: 'methodCallback',
        success: function( data ) {
            if( data.message == "yes" ) {

            } else {

        $.getScript("qc.js"); //files m including using this ajax
    $.getScript("tools.js");  //files m including using this ajax
            }
        }, 
        error: function( error ) {
            console.log( error ); 
        }
    });
}

and i am calling doThat() using <body onload="doThat();"> 我正在使用<body onload="doThat();">来调用doThat()

but i am getting the error in console Uncaught ReferenceError: qc_chat is not defined 但是我在控制台Uncaught ReferenceError: qc_chat is not defined遇到错误Uncaught ReferenceError: qc_chat is not defined

Thanks 谢谢

Answer 1

Since $.getScript is asynchronous, anything that depends on the script it loads must be done in its callback function. 由于$.getScript是异步的，因此任何依赖于其加载的脚本的操作都必须在其回调函数中完成。 So it should be: 所以应该是：

$.getScript('qc.js', function() {
    qc_chat.setup('<?php echo $p; ?>');
});

Answer 2

When I can't to edit the place where some modules connects, I use this snippet: 当我无法编辑某些模块的连接位置时，请使用以下代码段：

var waitForqcchat = setInterval(function(){
  if(typeof qcchat != 'undefined'){
    clearInterval(waitForqcchat);
    //here I sure, that module connected
    qcchat.setup('<?=$p?>');
  }
}, 200);

You should also write a logic to limit waiting if qcchat can never to be connected 您还应该编写逻辑来限制如果无法连接qcchat的等待

JavaScript中出现意外的未定义错误

问题描述

2 个解决方案

解决方案1
3 2013-10-09 18:09:05

解决方案2
0 2013-10-09 18:19:18

JavaScript中出现意外的未定义错误

问题描述

2 个解决方案

解决方案1 3 2013-10-09 18:09:05

解决方案2 0 2013-10-09 18:19:18

解决方案1
3 2013-10-09 18:09:05

解决方案2
0 2013-10-09 18:19:18