vue重要知识点

1基础部分https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https:///xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https：//xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https://xueqiu.com/6766220019...https：//xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...https://xueqiu.com/4626333155...1.1v-if与v-showv-ifhidden隐藏节点的区别，v-showhiddencss显示：无显示和隐藏频繁切换建议使用v-show，频率较少建议使用v-if1.2的区别watch和computedwatch监控当数据发生变化时，computed会从现有数据中计算出新的数据。watch没有缓存，computed有缓存。watch不能是异步的，但是computed可以是异步的。watch是一对多的关系，而computed是多对一的关系。1.3watch的深度监控handler还有一个deep参数实现深度监控watch引用类型没有oldval参数的作用1.4v-for循环关键：Vue需要dom进行patch（差异比较）重要识别，使用auniquekeyvalue可以有效优化vuedomtemplaterenderingkey建议使用dataunique注意iddocid避免使用index和random1.5事件vue事件是原生的js事件挂载到当前元素stoponceprevent事件修饰符.up.enter.esc.spacevue事件组件是原生js事件挂载到当前元素stoponcebuttonmodifier.left.right.bottom.top1.6组件传参propsparentpasschild$emitchildpassparentbus=newVue()this.on(name,e=>)2.这是。on(name,e=>{})2.this.on(name,e=>)2.this.emit(name,data)this.$off(name)1.7生命周期顺序创建：从外到内创建,从内到外parentbeforeCreatedsonbeforecreatedsonmouredparentmountedupdate：从外到内，从内到外sonbeforeupdiatesonupdatedparentupdated2进阶部分2.1$set(name,index,value)更新name数据的索引项，强制更新view2.2$nextTickdom节点渲染完成的回调，如果获取到更新数据，可以使用，this.$nextTick(()=>{})2.3dynamicComponent2.4混合mixins提取多个组件的公共逻辑和数据Mixins:{xxx,yyy}2.5Components实现v-model语法糖，简写形式实现数据modal的双向绑定：{props:"value",event:"input"}2.6.sync子组件和赋值数据双向绑定的简写：visible.sync="xxx"是简写：visible@update:visible简写要求子组件更新数据时必须$emit("update":visible,value)3进阶的s3.1vuetemplate模板编译成什么？答：Vue的template其实就是编译成一个render函数，执行并返回一个虚拟的dom节点。3.2请以js对象的形式描述html标签（js模拟dom节点，虚拟dom）contentinline

3.3虚拟dom描述（createElement函数）1.标签名tag2。属性attrs/propertys3。子节点children`ContentInline

{tag:"p"",propertys:{id:"best"}children[{tag:"a",children:["content"]},{tag:"span",children:["inline"]}]}`*1*2*3*4*5*6*7*8*9*10*11*123.4renderwebpackvue-template-compiler将template转为render函数createElement(创建虚拟dom节点)标签name属性子节点，value直接支持jsx语法功能：动态创建组件，生成模板``*1*2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17*18*19*20*21*22*23*24*25*26*27*28*29*30*31*32*33*34*35*36*37*38*39*40*41*42*43*44*45*46*47*48*49*50*51*52*53*54*55*56*57*58*59*60*61*62*63*64*65*66*67*68*69*70*71*72*73*74*75*76*77*78*79*80*81*82*83*84*85*86*87*88*89*90*91*92*93*94*95*96*97*98*99*100*101*102*103*104*105*106*107*108*109*110*111*112*113*114*115*116*117*118*119*120*121*122*123*124*125*1.763.5说说你对vue仿dom的理解1.vdom的本质是通过js模拟dom节点，并对dom渲染和运行进行优化2.使用diff算法检查现有dom节点与最新dom节点的差异3.使用patch方法最小化差异并更新渲染diff1。只比较同一级别的节点。2.如果标签不同，则将其删除。3.如果标签相同，则密钥保持不变。