Window: hashchange event

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)

你可以在 addEventListener 方法中使用 hashchange 事件：

window.addEventListener('hashchange', function() {
  console.log('The hash has changed!')
}, false);

或使用 onhashchange 事件处理程序属性：

function locationHashChanged() {
  if (location.hash === '#cool-feature') {
    console.log("You're visiting a cool feature!");
  }
}

window.onhashchange = locationHashChanged;

• popstate
• WindowEventHandlers.onhashchange