我正在尝试让 GM_xmlhttpRequest 调用同步运行,但我无法让它像我期望的那样工作:
I'm trying to get a GM_xmlhttpRequest call to behave synchronously, but I can't get it to work like I expect:
function myFunction (arg) { var a; GM_xmlhttpRequest ( { method: "GET", url: "example/sample/url", synchronous: true, onload: function (details) { a = details.responseText; } } ); return a; } b = myFunction (); alert (b);b 在这里我再也没有得到任何回报;它是未定义的.我在这里缺少一些步骤吗?我正在使用 v0.9.13 的 Greasemonkey 和 v9.0.1 的 Firefox.
I never get anything back for b here; it's undefined. Is there some step that I'm missing here? I'm using v0.9.13 of Greasemonkey, and v9.0.1 of Firefox.
推荐答案刚刚在 Google 上偶然发现了这个话题.
Just stumbled upon this topic in Google.
同步 GM_xmlhttpRequest 返回结果,而不是在 onload-callback 中执行.
Synchronous GM_xmlhttpRequest RETURN the result instead of executing it in the onload-callback.
所以这是对的:
var details = GM_xmlhttpRequest({ method:"GET", url:"site/sample/url", synchronous: true }); a = details.responseText;您在开始时创建了 var "a",从不填充它并返回它.因此,它是未定义的.
You create the var "a" in the beginning, never fill it and return it. Therefore, it is undefined.
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