vue学习(五)基础入门-基础知识(6)

刺骨的言语ヽ痛彻心扉 2023-05-29 05:01 2阅读 0赞

事件监听 v-on

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![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXhpbnU_size_16_color_FFFFFF_t_70 1][]

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方法有参数而不传参数

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方法有参数而没有加括号

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXhpbnU_size_16_color_FFFFFF_t_70 6][]

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![20191103163456423.png][]

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v-on 修饰符

.stop 修饰符的使用

使用前

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXhpbnU_size_16_color_FFFFFF_t_70 9][]

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使用后

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v-on 常用修饰符

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXhpbnU_size_16_color_FFFFFF_t_70 13][]

vue 条件判断

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登录切换的小案例

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v-show

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXhpbnU_size_16_color_FFFFFF_t_70 18][]

v-show 和 v-if 的区别

*  v-if是真正的条件渲染，他会确保在切换过程中条件块内的时间和子组件被销毁和重建（组件被重建将会调用created）
 *  v-show不论如何，都会被渲染在DOM中，当条件为真值时，将会修改条件的css样式
 *  v-if有更高的切换开销，v-show有更高的初始渲染开销
 *  v-if是动态的向DOM树内添加或者删除DOM元素；v-show是通过设置DOM元素的display样式属性控制显隐；
 *  v-if切换有一个局部编译/卸载的过程，切换过程中合适地销毁和重建内部的事件监听和子组件；v-show只是简单的基于css切换；
 *  v-if是惰性的，如果初始条件为假，则什么也不做；只有在条件第一次变为真时才开始局部编译（编译被缓存？编译被缓存后，然后再切换的时候进行局部卸载); v-show是在任何条件下（首次条件是否为真）都被编译，然后被缓存，而且DOM元素保留；
 *  v-if有更高的切换消耗；v-show有更高的初始渲染消耗；
 *  v-if适合运营条件不大可能改变；v-show适合频繁切换。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXhpbnU_size_16_color_FFFFFF_t_70 19][]

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[20191103163456423.png]: https://img-blog.csdnimg.cn/20191103163456423.png
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