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                ## if和show if比show有更多的計算消耗.show是對display設為block和none.if是直接創建和移除元素. if有較高的切換性能消耗,show有較高的渲染消耗.推薦使用show. ``` <div id="app"> <input type="button" value="切換" @click="change"> <h3 v-if="flag">v-if控制</h3> <h3 v-show="flag">v-show控制</h3> </div> </body> <script> new Vue({ el: '#app', data: { flag: true }, methods:{ change:function () { this.flag = !this.flag; } } }) </script> ```
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