- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
- <title>Examples</title>
- <meta name="description" content="">
- <meta name="keywords" content="">
- <link href="" rel="stylesheet">
- <script src="https://cdn.bootCSS.com/vue/2.4.2/vue.min.js"></script>
- </head>
- <body>
- <div id="app">
- <input type="text" v-model="items.text" ref="count"/>
- <div v-html="number"></div>
- </div>
- <script>
- new Vue({
- el: ‘#app‘,
- data: {
- number: ‘100‘,
- items: {
- text:‘‘,
- },
- },
- watch:{ //watch()监听某个值(双向绑定)的变化,从而达到change事件监听的效果
- items:{
- handler:function(){
- var _this = this;
- var _sum = 100; //字体限制为100个
- _this.$refs.count.setAttribute("maxlength",_sum);
- _this.number= _sum- _this.$refs.count.value.length;
- },
- deep:true
- }
- }
- })
- </script>
- </body>
- </html>
来源: http://www.bubuko.com/infodetail-2286656.html