为什么来自用户脚本的窗口(和不安全窗口)与来自 <script> 的窗口不同?标签? [英] Why is window (and unsafeWindow) not the same from a userscript as from a <script> tag?
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问题描述
我在开发这个小用户脚本.当我想用我的脚本阻止正在运行的网站中的每个 XMLHttpRequest 时，什么也没有发生(至少对于 Chrome):
I was facing an issue while developing this small userscript. When I wanted to block every XMLHttpRequest from the running website with my script, nothing was happening (at least with Chrome):
function main() {
// Override XHR.open with a custom function
window.XMLHttpRequest.prototype.open = function() {
// Nothing... so it's supposed to block every xhr.open() call
}
}
main();
用 unsafeWindow 替换 window 也是一样.
Same thing when replacing window by unsafeWindow.
然而，当我使用这个小技巧时，一切都像一个魅力:
However, when I used this little trick, everything worked like a charm:
// No more call to main(), and:
var script = document.createElement("script");
script.textContent = "(" + main.toString() + ")();";
document.body.appendChild(script);
对 xhr.open 的每次调用都被我的自定义函数取代，不再是 AJAX.
Every call to xhr.open is replaced by my custom function, no more AJAX.
所以我猜 window 元素在从脚本内部调用 main 和从
