将事件日志中的更新推送到IE8中不起作用的网页 [英] Pushing updates from event log to webpage not working in IE8
问题描述
在我的MVC4应用程序中,我有一些代码将事件日志中的新条目推送到带有SignalR的网页。此代码适用于FireFox,但在IE8中,当新事件添加到事件日志时,调试器弹出错误:对象不支持此属性或方法
并停止在以下代码中:
In my MVC4 application I have some code to push a new entry in the eventlog to a webpage with SignalR. This code works in FireFox, but in IE8 when a new event is added to the event log the debugger pops up with Error: Object doesn't support this property or method
and stops at the following code:
this.notifyListeners = function (queryName, evt) {
registeredListeners.forEach(function (item) {
if (item.queryName === queryName) {
item.listener.newEvent(evt);
}
});
};
当我跳过此方法时,调试器关闭,事件显示在页面上。为什么会发生这种情况?如何解决这个问题?
When I step over this method the debugger closes and the event is shown on the page. Why does this happen and how can I workaround this?
推荐答案
forEach
在IE8中不支持你需要填充
forEach
is not supported in IE8 you need to polyfill
像这里建议的那样:
if (!Array.prototype.forEach)
{
Array.prototype.forEach = function(fun /*, thisArg */)
{
"use strict";
if (this === void 0 || this === null)
throw new TypeError();
var t = Object(this);
var len = t.length >>> 0;
if (typeof fun !== "function")
throw new TypeError();
var thisArg = arguments.length >= 2 ? arguments[1] : void 0;
for (var i = 0; i < len; i++)
{
if (i in t)
fun.call(thisArg, t[i], i, t);
}
};
}
或者$ c $执行和标准 c>循环,类似于:
Or perform and standard for
loop, something like:
this.notifyListeners = function (queryName, evt) {
var item={};
for (i=0;i<registeredListeners.length;i++){
item = registeredListeners[i];
if (item.queryName === queryName) {
item.listener.newEvent(evt);
}
}
};
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