Javascript：onHashchange 测试
我正在尝试检查浏览器是否支持 onHashChange 或如果不支持则不隐藏某些代码，以这种方式：
if(window.onhashchange){
...code...
} else {
...other code...
}
我也尝试过此操作：
if(typeof window.onhashchange === "function"){
alert("Supports");
} else {
alert("Doesn't Supports");
}
如 Quirksmode 这应该可以工作，但是如果我在 alert 中执行例如 < Safari 中的 code>true state 会提醒我，但 Safari 不支持 onHashChange ：S
它有什么问题？如果我的方法不对，我该如何检查？
I'm trying to check if the browser supports onHashChange or not to hide some code from it if not, in this way:
if(window.onhashchange){
...code...
} else {
...other code...
}
I tried this too:
if(typeof window.onhashchange === "function"){
alert("Supports");
} else {
alert("Doesn't Supports");
}
As described on Quirksmode this should work but if I do an alert for example in true state in Safari than alerts me but Safari is not supporting onHashChange :S
What's the problem with it? If I'm not on the right way how should I check it?
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您可以使用
in运算符检测此事件：另请参阅：
onhashchangeYou can detect this event by using the
inoperator:See also:
onhashchangewithout setInterval请注意，最好使用特征检测而不是存在推断（例如窗口中的“onhashchange”）。
@xkit 向我解释了一个很好的功能测试，可以解决这样一个事实：尽管 IE7 不支持 onhashchange，但对于存在推断，例如 if("onhashchange" in window){/code ，它仍然会返回 true /} 在 IE8 中使用 IE7 标准文档模式时。
@xkit 建议在 onhashchange 事件的处理函数中设置一个标志（例如 var isSet = true;）。然后使用 JavaScript 更改 window.location.hash 并查看是否设置了该标志。
Be warned that you're better off using feature detection rather than existence inference (such as "onhashchange" in window).
@xkit explained to me a good feature test to work around the fact that although IE7 doesn't support onhashchange it would still return true for existence inference such as if("onhashchange" in window){/code/} when using IE7 Standard Document Mode in IE8.
What @xkit suggested was setting a flag (such as var isSet = true;) within a handler function for the onhashchange event. Then changing window.location.hash using JavaScript and see if the flag was set.
自 Quirksmode 文章撰写以来，您所使用的 Safari 版本可能已添加了对
onhashchange事件的支持。测试应该仍然有效；在您知道不支持该事件的其他浏览器中尝试一下。编辑：另外，您应该使用@CMS描述的方法，因为默认情况下该事件不包含函数；因此这两个测试都会失败。
It's likely that the version of Safari that you're using has added support for the
onhashchangeevent since the time that that Quirksmode article was written. Tests should still be valid; try it in other browsers you know not to support the event.Edit: also, you should use the method described by @CMS instead, as the event will not contain a function by default; thus both of those tests will fail.
if (window.onhashchange !== undefined)alert('支持 onhashchange');
if (window.onhashchange !== undefined) alert('Supports onhashchange');