第一个浅度监听：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script type="text/javascript" src="js/vue.js"></script> </head> <body> <div id="app"> <p>{{a}}</p> <p>{{b}}</p> </div> <script> var vm=new Vue({ el:"#app", data:{ a:10, b:15 } }); vm.$watch("a",function(){ alert('a变化了'); this.b=100; }); document.οnclick=function(){ vm.a=2 } </script> </body> </html> 第二个深度监听 <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script type="text/javascript" src="js/vue.js"></script> </head> <body> <div id="app"> <p>{{a|json}}</p> <p>{{b}}</p> </div> <script> var vm = new Vue({ el: "#app", data: { a: { id: "1", title: "width" }, b: 15 } }); vm.$watch("a", function() { alert('a变化了'); this.b = 100; }, { deep: true }); document.onclick = function() { vm.a.id = "2"; } </script> </body> </html>