我正在尝试覆盖MSHTML实例上的计时器方法(setTimeout
,clearTimeout
,setInterval
和clearInterval
),因此我可以跟踪已添加到的函数setTimeout
/ setInterval
并阻止脚本退出,直到调用或删除这些函数。
在包装器setTimeout
函数中调用原始setTimeout
时,我收到权限被拒绝错误:
var window = new ActiveXObject('htmlfile').parentWindow.window;
var _setTimeout = window.setTimeout;
var timeouts = {};
setTimeout = function (code, ms, lang) {
//script fails here - Permission denied
var id = _setTimeout(code, ms, lang || 'javascript');
timeouts[id] = true;
return id;
};
setTimeout(function () {
window.alert('Timed function');
}, 1000);
var testTimeouts = function () {
var i;
for (i in timeouts) {
if (timeouts[i]) {return false;}
}
};
while (!testTimeouts()) {
WScript.Sleep(100);
}
window.alert('At end of script');
我可以在覆盖之前将代码传递给原始setTimeout
:
window.setTimeout(function () {
window.alert('Timed function');
}, 1000);
WScript.Sleep(2500);
window.alert('At end of script');
保留原始上下文(如答案似乎已消失)不起作用:
window._setTimeout = window.setTimeout;
var timeouts = {};
window.setTimeout = function (code, ms, lang) {
var id = window._setTimeout(code, ms, lang || 'javascript');
timeouts[id] = true;
return id;
};
window.setTimeout(function () {
window.alert('Timed function');
}, 1000);
window._setTimeout
与Object doesn't support this property or method
的通话失败。
我应该注意到我正在运行IE8,WinXP SP3,JScript 5.8。
答案 0 :(得分:1)
为什么不从存储的窗口中调用setTimeout
?
var setTimeout;
var timeouts = {};
(function() {
var window = new ActiveXObject('htmlfile').parentWindow;
setTimeout = function(code, delay, lang){
var id = window.setTimeout(code, delay, lang || 'javascript');
timeouts[id] = true;
return id;
};
})();