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50 lines
1.4 KiB
50 lines
1.4 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>自定义指令</title>
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<script type="text/javascript" src="../vue.js"></script>
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</head>
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<body>
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<div id="root">
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<h2>当前的n值是：<span v-text="n"></span></h2>
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<h2>放大10倍的n值是：<span v-big="n"></span></h2>
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<button @click="n++">n+1</button>
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<hr/>
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<input type="text" v-fbind:value="n" >
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</div>
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<script type="text/javascript">
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Vue.config.productionTip = false // 组织开发环境提示
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// 创建Vue实例
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const x = new Vue({
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el: '#root',
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data: {
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n: 1,
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},
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directives: {
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// big函数何时会被调用？1.指令与元素成功绑定时；2.指令所在模板被重新解析时
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big(element, binding) {
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element.innerText = binding.value * 10
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},
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fbind: {
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// 绑定时调用
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bind(element, binding){
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element.value = binding.value
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},
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// 渲染时调用
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inserted(element, binding){
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element.focus()
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},
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// 重新渲染时调用
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update(element, binding){
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element.value = binding.value
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element.focus()
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}
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}
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}
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})
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</script>
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</body>
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</html>
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