vue 小项目(箭头函数的用法)
<!DOCTYPE html><html lang="zh"><head><meta charset="UTF-8"><meta
·
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div class="nav">
<ul>
<li>
<span>知乎</span>
</li>
<li>
<a href="">首页</a>
</li>
<li>
<a href="">发现</a>
</li>
<li>
<a href="">话题</a>
</li>
<li>
<div>
<input type="text" value="" placeholder="搜索你感兴趣的内容" />
<span>搜索</span>
</div>
</li>
<li class="info">
<div>消息</div>
</li>
</ul>
</div>
<!-- <div onclick="test()" class="content">
</div> -->
<div id="app">
<button v-on:click="haha"> 查看新闻</button>
<button v-on:click="next"> 下一页</button>
<div class="news">
<li v-for="message of messages">
{{ message.content }}
</li>
</div>
</div>
<footer>
designed by etob
</footer>
<script src="https://cdn.jsdelivr.net/npm/vue"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<style type="text/css">
body {
width: 75%;
margin: 0 auto;
text-align: center;
}
.nav {
height: 45px;
border-bottom: 1px solid red;
margin-bottom: 15px;
}
ul {
display: flex;
list-style: none;
}
a {
text-decoration: none;
}
li {
margin-left: 2%;
}
.info {
justify-content: end;
margin-left: 20%;
}
input {
padding: 0;
border: 55%;
}
.content {
margin: 0 auto;
width: 500px;
height: 500px;
background: aquamarine;
}
footer {
text-align: center;
}
#app .news {
text-align: start;
}
#app li {
list-style: none;
}
</style>
<script>
var app = new Vue({
el: '#app',
data: {
messages: [
{}
],
page: 1
},
methods: {
haha: function test() {
// alert("SS");
// 可选地,上面的请求可以这样做
axios.get('https://www.apiopen.top/satinCommentApi?id=27610708', {
params: {
page: this.page
}
}).then((data) => {
console.log(data.data.data.normal.list);
//Vue.set(app, 'messages', data.data.data.normal.list)
this.messages = data.data.data.normal.list;
//Vue.set(app.messages, data.data.data.normal.list)
}).catch(function (error) {
console.log(error);
});
},
//这里用 箭头函数的话 取不到 this.page
next: function () {
this.page = (parseInt(app.page) + 1);
alert(this.page);
axios.get('https://www.apiopen.top/satinCommentApi?id=27610708', {
params: {
page: this.page
}
}).then((data) => {
Vue.set(app, 'messages', data.data.data.normal.list)
}).catch(function (error) {
console.log(error);
});
}
}
})
</script>
</body>
</html>
注意箭头函数的作用域
箭头函数不会自动绑定局部变量,如this,arguments,super(ES6),new.target(ES6)等
所以箭头函数没有它自己的this值,箭头函数内的this值继承自外围作用域。在箭头函数中调用 this 时,仅仅是简单的沿着作用域链向上寻找,找到最近的一个 this 拿来使用
更多推荐
已为社区贡献2条内容
所有评论(0)