hashchange

当URL的片段标识符更改时，将触发hashchange事件 (跟在＃符号后面的URL部分，包括＃符号)

通用信息

规范
HTML5
接口
HashChangeEvent
是否冒泡
是
能否取消默认行为
不能
目标
defaultView
默认行为
无

属性

Property Type Description
target 只读 EventTarget The browsing context (window).
type 只读 DOMString The type of event.
bubbles 只读 Boolean Whether the event normally bubbles or not.
cancelable 只读 Boolean Whether the event is cancellable or not.
oldURL 只读 String The previous URL from which the window was navigated.
newURL 只读 String  

浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 5.0 3.6 (1.9.2)
Firefox 6 中加入对 oldURL/newURL 属性的支持.		 8.0 10.6 5.0
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 2.2 1.0 (1.9.2) 9.0 11.0 5.

这个页面里有几个用JavaScript模拟该事件的脚本,原理基本上都是隔一段时间检测一下location.hash是否发生变化.下面的这个实现可以在<code>window.onhashchange</code>属性上绑定事件处理函数:

(function(window) {

  // 如果浏览器原生支持该事件,则退出  
if ( "onhashchange" in window.document.body ) { return; }

  var location = window.location,
    oldURL = location.href,
    oldHash = location.hash;

  // 每隔100ms检测一下location.hash是否发生变化
  setInterval(function() {
    var newURL = location.href,
      newHash = location.hash;

    // 如果hash发生了变化,且绑定了处理函数...
    if ( newHash != oldHash && typeof window.onhashchange === "function" ) {
      // execute the handler
      window.onhashchange({
        type: "hashchange",
        oldURL: oldURL,
        newURL: newURL
      });

      oldURL = newURL;
      oldHash = newHash;
    }
  }, 100);

})(window);

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