vue父组件和子组件通过sync实现双向数据绑定

2018-07-13 992 浏览 63 点赞

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>sync</title>
    <script src="../vue.js"></script>
  </head>
  <body>
    <div id="app">
      <div class="hello">

        //input实时改变wrd的值, 并且会实时改变box里的内容
        <input type="text" v-model="wrd">

        <box :word.sync="wrd"></box>

      </div>
    </div>
    <script type="text/javascript">
      Vue.component('box', {
        data() {
          return {
            str: '',
          }
        },
        props: {
          word: ''
        },
        watch: {
          str: function(newValue, oldValue) {
            //每当str的值改变则发送事件update:word , 并且把值传过去
            this.$emit('update:word', newValue)
          }
        },
        template: `<div class="hello">
                    <div class="ipt">
                      <input type="text" v-model="str">
                    </div>
                    //word是父元素传过来的
                    <h2>{{ word }}</h2>
                  </div>`
      });
      var vm = new Vue({
        el: '#app',
        data() {
          return {
            wrd: ''
          }
        }
      });
    </script>
  </body>
</html>

from:https://blog.csdn.net/kingov/article/details/78367809