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                ### 說一說 HashRouter 和 HistoryRouter的區別和原理? 1. 這兩個都是前端路由的實現方式 2. 從表現上來看,hash模式下的url會帶有#,history沒有,但是history模式需要與后端配合處理,否則會出現404 3. 從實現上看,hashRouter的原理是通過window.onhashchange方法獲取新url的hash值,再render頁面組件到view-router上;而historyRouter的是通過window.onpopstate監聽瀏覽器的前進和后退,但是不帶#號跳轉,會出現瀏覽器的頁面刷新,這里是通過history.pushState方式實現的跳轉不刷新的
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