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免费的网站搭建,免费建站平台,网上免费做网站,军事新闻内容摘抄2 v-model 之 lazy、number、trim lazy：等待input框的数据绑定时区焦点之后再变化 number：数字开头，只保留数字，后面的字母不保留；字母开头，都保留 trim：去除首位的空格<!DOCTYPE html> …

2 v-model 之 lazy、number、trim

lazy：等待input框的数据绑定时区焦点之后再变化
number：数字开头，只保留数字，后面的字母不保留；字母开头，都保留
trim：去除首位的空格

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="./js/vue.js"></script>
</head>
<body>
<div id="app"><h1>input 和v-model</h1><input type="text" v-model="name"><h1>v-model修饰符：lazy、number、trim</h1><input type="text" v-model.lazy="s1">--->{{s1}}<br><input type="text" v-model.number="s2">--->{{s2}}<br><input type="text" v-model.trim="s3">--->{{s3}}</div>
</body>
<script>var vm = new Vue({el: '#app',data: {name: '彭于晏',s1: '',s2: '',s3: '',},})
</script>
</html>

3 与后端交互

# 1 使用jq的ajax  ===》不好---》引入了jq框架，好多功能用不到
# 2 原生js  fetch提供了一个 JavaScript 接口，用于访问和操纵 HTTP 管道的一些具体部分fetch('http://127.0.0.1:5000/userinfo').then(response => {return response.json();}).then(data => {this.username = data.usernamethis.age = data.age});
# 3 axios  第三方ajax，只有ajax，没有别的，小--》底层还是基于XMLHttpRequest<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.0/axios.min.js"></script>

3.1 jq发送

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="./js/vue.js"></script><script src="./js/jq.js"></script>
</head>
<body>
<div id="app"><h1>与后端交互</h1><button @click="handleLoad">加载用户信息</button><p>用户名：{{username}}</p><p>年龄：{{age}}</p></div>
</body>
<script>var vm = new Vue({el: '#app',data: {username: '',age: ''},methods: {handleLoad() {// 后端发送请求，拿到数据，赋值给 username和age 页面就有了// 1 发送请求方式1 使用 jq的ajax$.ajax({url: 'http://127.0.0.1:5000/userinfo',method: 'get',success: data => {// CORS policy  跨域问题---》解决---》后端响应头中加入：Access-Control-Allow-Originconsole.log(typeof data)data = JSON.parse(data)this.username = data.usernamethis.age = data.age}})}}})
</script>
</html>

3.2 原生js

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="./js/vue.js"></script><script src="./js/jq.js"></script>
</head>
<body>
<div id="app"><h1>与后端交互</h1><button @click="handleLoad">加载用户信息</button><p>用户名：{{username}}</p><p>年龄：{{age}}</p></div>
</body>
<script>var vm = new Vue({el: '#app',data: {username: '',age: ''},methods: {handleLoad() {// 后端发送请求，拿到数据，赋值给 username和age 页面就有了// 1 原生fetch发送请求fetch('http://127.0.0.1:5000/userinfo').then(response => {return response.json();}).then(data => {this.username = data.usernamethis.age = data.age});}}})
</script>
</html>

3.3 axios

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="./js/vue.js"></script><script src="https://unpkg.com/axios/dist/axios.min.js"></script></head>
<body>
<div id="app"><h1>与后端交互</h1><button @click="handleLoad">加载用户信息</button><p>用户名：{{username}}</p><p>年龄：{{age}}</p></div>
</body>
<script>var vm = new Vue({el: '#app',data: {username: '',age: ''},methods: {handleLoad() {// 后端发送请求，拿到数据，赋值给 username和age 页面就有了// 1 axios发送请求axios.get('http://127.0.0.1:5000/userinfo').then(res => {console.log(res.data); //真正的响应体的数据在res.datathis.username = res.data.usernamethis.age = res.data.age}).catch(error => {console.log(error);});}}})
</script>
</html>

4 小电影案例

4.1 后端

from flask import Flask, jsonify
import jsonapp = Flask(__name__)@app.route('/film', methods=['GET'])
def film():with open('./film.json', 'rt', encoding='utf-8') as f:res = json.load(f)res=jsonify(res)res.headers['Access-Control-Allow-Origin']='*'return resif __name__ == '__main__':app.run()

4.2 前端

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="./js/vue.js"></script><script src="./js/axios.js"></script></head>
<body>
<div id="app"><h1>点击显示小电影案例</h1><button @click="handleLoad">加载</button><div v-for="film in filmList"><img :src="film.poster" alt="" height="200px" width="150px"><div><h3>{{film.name}}</h3><p>主演：<span v-for="item in film.actors">{{item.name}} &nbsp;&nbsp;</span></p><p>{{film.nation}}|{{film.runtime}}</p></div></div></div>
</body>
<script>var vm = new Vue({el: '#app',data: {filmList: []},methods: {handleLoad() {axios.get('http://127.0.0.1:5000/film').then(res => {if (res.data.code == 100) {this.filmList = res.data.results} else {alert(res.data.msg)}})}}})
</script>
</html>