源代码 ：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Vue 测试实例 - 开源教程(ossoft.cn)</title> <script src="https://unpkg.com/vue@next"></script> </head> <body> <div id="app" class="demo"></div> <script> const app = Vue.createApp({ data() { return { count: 4 } } }) const vm = app.mount('#app') document.write(vm.$data.count) // => 4 document.write("<br>") document.write(vm.count) // => 4 document.write("<br>") // 修改 vm.count 的值也会更新 $data.count vm.count = 5 document.write(vm.$data.count) // => 5 document.write("<br>") // 反之亦然 vm.$data.count = 6 document.write(vm.count) // => 6 </script> </body> </html>
运行结果