外部數(shù)據(jù)檢測(cè)不到？
請(qǐng)問(wèn)這是什么原因呀？
qq_色狼_iqAJM9
2019-07-18
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2019-07-18
這個(gè)由于this作用域的問(wèn)題，你的代碼中的this.arr的this代表著是當(dāng)前的Vue實(shí)例，所以是undefined，你換成arr，去掉this. 試試？
2019-07-18
這是代碼 <body> <div?id="app"> ????<div> ????????{{msg}} ????????<p>{{msg1}}</p> ????</div> </div> <script> ????var?arr?=?'new?test' ???var?app=?new?Vue({ ????????el:'#app', ????????data:{ ????????????msg:'hello?vue!!', ????????????another:'GoodBey?vue!!' ????????}, ????????watch:{ ????????????msg:function(newval,oldval){ ????????????????console.log('newval?is:'+newval) ????????????????console.log('oldval?is:'+oldval) ????????????}, ????????}, ????????computed:{ ????????????msg1:function(){ ????????????????return?'computed:'?+?this.msg?+'?,?'+?this.another?+?this.arr ????????????} ????????}, ???????methods:{ ???????} ????}) </script> </body>