v-bind只能單向綁定
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="../lib/vue.js"></script>
<body>
<div id="app">
<h4>{{msg}}</h4>
<input type="text" style="width: 100%;" v-bind:value="msg">
</div>
<script>
var vm = new Vue({
el: "#app",
data: {
msg: '如何實現雙向數據綁定'
},
method: {
}
})
</script>
</body>
</html>
![在這裏插入圖片描述]()
v-model實現雙向綁定
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="../lib/vue.js"></script>
<body>
<div id="app">
<h4>{{msg}}</h4>
<input type="text" style="width: 100%;" v-model="msg">
</div>
<script>
var vm = new Vue({
el: "#app",
data: {
msg: '如何實現雙向數據綁定'
},
method: {
}
})
</script>
</body>
</html>
![在這裏插入圖片描述]()
簡易計算器
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="../lib/vue.js"></script>
<body>
<div id="app">
<input type="text" v-model="n1" >
<select v-model="opt">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" v-model="n2" >
<input type="button" value="=" @click="calc">
<input type="text" v-model="result" >
</div>
<script>
var vm = new Vue({
el: "#app",
data: {
n1:0,
n2:0,
result:0,
opt:'+'
},
methods: {
calc(){
switch (this.opt) {
case "+":
this.result=parseInt(this.n1)+parseInt(this.n2)
break;
case "-":
this.result=parseInt(this.n1)-parseInt(this.n2)
break;
case "*":
this.result=parseInt(this.n1)*parseInt(this.n2)
break;
case "/":
this.result=parseInt(this.n1)/parseInt(this.n2)
break;
}
}
}
})
</script>
</body>
</html>
