5

我在这里有这段代码:

var infiltrationResult;

while(thisOption) {
    var trNode = document.createElement('tr');
    var tdNode = document.createElement('td');
    var hrefNode = document.createElement('a');

    infPlanetID = thisOption.getAttribute('value');

  var myURL = "http://www.hyperiums.com/servlet/Planetinf?securitylevel=90&newinfiltr=New+infiltration&planetid=" + PlanetID + "&infplanetid=" + infPlanetID;

    GM_xmlhttpRequest({
        method: 'GET',
        url: myURL,
        headers: {
            'User-agent': 'Mozilla/4.0 (compatible) Greasemonkey',
            'Accept': 'application/atom+xml,application/xml,text/xml',
        },
        onload: function(responseDetails) {
                if (responseDetails.responseText.match(/<b>Invalid order<\/td><\/tr><tr><td><BR><center><font color=#AAAA77 face=verdana,arial size=2>The target planet is blocking all infiltrations[\s\S]<BR><BR>/im)) {
                    // Successful match
                    infiltrationResult = 'Invalid Order';
                } else {
                    // Match attempt failed
                    infiltrationResult = 'Infiltration Successfully Created';
                }
        }
    });

当我添加

警报(渗透结果);

分配后,我正确地看到了字符串。

但是,在函数退出后,我尝试了相同的警报,我得到:

undefined

任何想法我做错了什么?

4

2 回答 2

8

请求异步运行。这就是该函数首先采用onload回调函数的原因。如果它是同步的,那么GM_xmlhttpRequest将像普通函数一样简单地返回响应详细信息。

在等待请求返回时,调用后的代码GM_xmlhttpRequest继续运行。您的脚本正确识别出infiltrationResult未定义的内容,因为请求尚未完成。

如果您需要做的不仅仅是在请求返回时分配变量,请在onload回调中执行此操作。

于 2009-02-08T06:21:55.937 回答
1

试试这个:

var infiltrationResult;

while(thisOption) {
    var trNode = document.createElement('tr');
    var tdNode = document.createElement('td');
    var hrefNode = document.createElement('a');

    infPlanetID = thisOption.getAttribute('value');

  var myURL = "http://www.hyperiums.com/servlet/Planetinf?securitylevel=90&newinfiltr=New+infiltration&planetid=" + PlanetID + "&infplanetid=" + infPlanetID;

    GM_xmlhttpRequest({
        method: 'GET',
        url: myURL,
        headers: {
            'User-agent': 'Mozilla/4.0 (compatible) Greasemonkey',
            'Accept': 'application/atom+xml,application/xml,text/xml',
        },
        onload: function(responseDetails) {
                        if (responseDetails.responseText.match(/<b>Invalid order<\/td><\/tr><tr><td><BR><center><font color=#AAAA77 face=verdana,arial size=2>The target planet is blocking all infiltrations[\s\S]<BR><BR>/im)) {
                                // Successful match
                                infiltrationResult = 'Invalid Order';
                        } else {
                                // Match attempt failed
                                infiltrationResult = 'Infiltration Successfully Created';
                        }
                        sentback(infiltrationResult);//Sent it when it loads only
        }
    });

function sentback(x){
    alert(x);
}
于 2010-11-26T12:36:43.937 回答