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The default routing mode in vue is "hash" mode. This mode uses the hash value of the URL as the route, simulates a complete URL, and supports all browsers. The principle behind hash mode is the onhashchange event, which can be monitored on the window object.
The operating environment of this tutorial: windows7 system, vue2.9.6 version, DELL G3 computer.
The routing in vue defaults to hash mode, which can be done with a pure front-end.
Hash: Use the hash value of the URL as the route. Supports all browsers.
The principle behind the hash mode is the onhashchange event, which can be monitored on the window object:
window.onhashchange = function(event){
console.log(event.oldURL, event.newURL);
let hash = location.hash.slice(1);
document.body.style.color = hash;
}The above code can change the page font color by changing the hash, although it is useless , but it illustrates the principle to a certain extent.
The more critical point is that because the URL that hash changes will be recorded by the browser, you will find that the browser's forward and backward can be used, and when you click back, the page font color will also change. Variety. In this way, although the browser did not request the server, the page status was associated with the URL one by one. Later, people gave it a domineering name called front-end routing, and it became the standard configuration of single-page applications.
Let’s write a simple method to test it
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div>测试一下</div>
<script type="text/javascript">
window.onhashchange = function(event){
console.log(event.oldURL,event.newURL)
let hash = location.hash.slice(1);
document.body.style.color = hash;
}
</script>
</body>
</html>
and the page can be changed by going forward and back in the browser.
NetEase Cloud Music and Baidu Netdisk use hash routing, which looks like this:
http://music.163.com/#/friend https://pan.baidu.com/disk/home#list/vmode=list
And the other two modes of vue routing:
History: Since HTML5 History API and server configuration. Refer to the HTML5 History mode on the official website
Abstract: Supports all javascript running modes. If it is found that there is no browser API, the routing will automatically force into this mode.
history routing
history.go(-2);//后退两次 history.go(2);//前进两次 history.back(); //后退 hsitory.forward(); //前进(2) Modify the historical status including There are two methods pushState and replaceState. These two methods receive three parameters: stateObj, title, url
history.pushState({color:'red'}, 'red', 'red')
window.onpopstate = function(event){
console.log(event.state)
if(event.state && event.state.color === 'red'){
document.body.style.color = 'red';
}
}
history.back();
history.forward();. The state of the page is saved in the state object through pushstate. When the url of the page changes back to this url When, this state object can be obtained through event.state, so that the page state can be restored. The page state here is the page font color. In fact, the position of the scroll bar, the reading progress, and the switch of the component can all be stored in inside the state. Through the history api, we lost the ugly #, but it also has a problem: We are not afraid of going forward or backward, but we are afraid of refreshing, f5, (if the backend is not prepared), Because the refresh actually requests the server. In hash mode, the front-end routing modifies the information in #, but the browser does not play with it when requesting, so there is no problem. But under history, you can freely modify the path. When refreshing, if there is no corresponding response or resource in the server, a 404 will be displayed every minute. [Related recommendations: "vue.js Tutorial"]
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