1.基本模板语法-通过html方式展示模板
当template中使用了html语法时，直接使用插值表达式是无法准确展示模板内容的。需要使用v-html指令来绑定模板数据。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo1</title>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
const app = Vue.createApp({
data() {
return {
message: '<strong>hello world</strong>'
}
},
template: '<div v-html="message"></div>',
});
const vm = app.mount('#root');
</script>
</html>
绑定属性值
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo2</title>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
const app = Vue.createApp({
data() {
return {
disable: false
}
},
template: '<input v-bind:disabled="disable">',
});
const vm = app.mount('#root');
</script>
</html>
使用指令v-once后，后续使用vm.$data.message=xxx的赋值形式，不会改变div的展示内容
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo3</title>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
const app = Vue.createApp({
data() {
return {
message: 'hello world'
}
},
//使用指令v-once后，后续使用vm.$data.message=xxx的赋值形式，不会改变div的展示内容
template: '<div v-once></div>',
});
const vm = app.mount('#root');
</script>
</html>
2.vue语法简写
v-on:click=”xxx”可以简写成@click=”xxx”。v-bind:title=”xxx”可以简写成:title=”xxx”
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo6</title>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
const app = Vue.createApp({
data() {
return {
message: 'hello world',
show: true
}
},
methods: {
handleClick() {
alert('click');
}
},
//v-on:click 可以简写成 @click。v-bind:title 可以简写成 :title
template: `<div @click="handleClick" :title="message"></div>`,
});
const vm = app.mount('#root');
</script>
</html>
3.阻止默认行为-网页跳转
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo7</title>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
const app = Vue.createApp({
data() {
return {
message: 'hello world',
show: true,
name: 'title',
event: 'click'
}
},
methods: {
handleClick(e) {
e.preventDefault();
}
},
template: `<form action="https://www.baidu.com" @click='handleClick'>
<button type="submit">提交</button>
</form>`,
});
const vm = app.mount('#root');
</script>
</html>
或者可以使用如下简写的方式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo7</title>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
const app = Vue.createApp({
data() {
return {
message: 'hello world',
show: true,
name: 'title',
event: 'click'
}
},
methods: {
handleClick() {
alert("click");
}
},
template: `<form action="https://www.baidu.com" @click.prevent='handleClick'>
<button type="submit">提交</button>
</form>`,
});
const vm = app.mount('#root');
</script>
</html>
4.计算属性和侦听器
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo9</title>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
// data & methods & computed & watcher
// computed 和 method 都能实现的一个功能，建议使用 computed，因为有缓存
// computed 和 watcher 都能实现的功能，建议使用 computed 因为更加简洁
const app = Vue.createApp({
data() {
return {
message: "hello world",
count: 2,
price: 5,
newTotal: 10,
}
},
watch: {
// price 发生变化时，函数会执行
price(current, prev) {
this.newTotal = current * this.count;
}
},
computed: {
// 当计算属性依赖的内容发生变更时，才会重新执行计算
total() {
return Date.now() + this.count;
// return this.count * this.price
}
},
methods: {
formatString(string) {
return string.toUpperCase();
},
// 只要页面重新渲染，才会重新计算
getTotal() {
return Date.now();
// return this.count * this.price;
},
},
template: `
<div> </div>
`
});
const vm = app.mount('#root');
</script>
</html>
5.vue样式写法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo10</title>
<style>
.red {
color: red;
}
.green {
color: green;
}
</style>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
const app = Vue.createApp({
data() {
return {
classString: 'red',
classObject: { red: false, green: true },
classArray: ['red', 'green', {blue: true}],
styleString: 'color: yellow;background: orange',
styleObject: {
color: 'orange',
background: 'yellow'
}
}
},
/*v-bind:class 简写 :class*/
/*$attrs.class 从父组件class属性上取值*/
template: `
<div :class="classString">
Hello World1
</div>
<div :class="classObject">
Hello World2
</div>
<div :class="classArray">
Hello World3
</div>
<div :class="classArray">
Hello World4
<demo class="red"/>
</div>
<div :style="styleObject">
Hello World5
</div>
`
});
app.component('demo', {
template: `
<div :class="$attrs.class">one</div>
<div :class="$attrs.class">two</div>
`
})
const vm = app.mount('#root');
</script>
</html>
6.条件渲染
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo11</title>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
const app = Vue.createApp({
data() {
return {
show: false,
conditionOne: false,
conditionTwo: true
}
},
/*v-if 控制是否显示是直接从dom上增加或者移除. v-show 控制是否显示是通过display属性控制是否显示*/
template: `
<div v-if="show">Hello World</div>
<div v-if="conditionOne">if</div>
<div v-else-if="conditionTwo">elseif</div>
<div v-else>else</div>
<div v-show="show">Bye World</div>
`
});
const vm = app.mount('#root');
</script>
</html>