seo网站平台,oa协同办公系统平台,商标注册网上查询,在吗做网站商城练习1:在输入框聚焦时,增加对键盘上下键按键的支持,相当于加1和减1 练习2:增加一个控制步伐的prop-step,比如设置为10,点击加号按钮,一次增加10
思路:
// 考虑到子模板的复用性,即在父模板中复用如下:
input-number v-modelvalue :max10 :mininput-number v-modelvalue :max10 :min0 :step3/input-number
// v-model将input中的值和父模板data下面value的值绑定到一起
// 可以通过:max,:min限制输入框的最大最小值
// 通过:step来设置子模版点击加号时的步伐(即,一次加多少)几个补充: focus: 用于绑定input的聚焦事件 blur: 用于绑定input的失去焦点事件 keyup.down: 绑定键盘的向下键 keyup.up: 绑定键盘的向上键
总体代码如下:
!DOCTYPE html
html
head
meta charsetutf-8
/head
bodydiv idappinput-number v-modelvalue :max10 :min0 :step3/input-number/divscript srchttps://unpkg.com/vue2.6.10/dist/vue.min.js/script
scriptVue.component(input-number,{template:\div classinput-number\input typetext :valuecurrentValue changehandleChange focushandleFocus blurhandleBlur keyup.downhandleArrowDown keyup.uphandleArrowUp\button clickhandleDown :disabledcurrentValue min-/button\button clickhandleUp :disabledcurrentValue max/button\/div,props:{max:{type:Number,default:Infinity},min:{type:Number,default:-Infinity},value:{type:Number,default:0},step:{type:Number,default:1}},data:function (){return {currentValue: this.value,isFocus:false}},methods:{handleUp:function() {this.currentValue this.step;},handleDown:function() {this.currentValue - this.step;},isValueNumber:function(value) {return (/(^-?[0-9]\.{1}\d$)|(^-?[1-9][0-9]*$)|(^-?0{1}$)/).test(value );},handleChange:function(event){let val event.target.value.trim();let max this.max;let min this.min;if(this.isValueNumber(val)){val Number(val);this.currentValue val;if(val max){this.currentValue max;} else if (val min) {this.currentValue min;}} else {event.target.value this.currentValue;}},updateValue:function(val){if(val this.max) val this.max;if(val this.min) val this.min;this.currentValue val;},handleFocus:function(){this.isFocus true},handleBlur:function(){this.isFocus false},handleArrowDown:function(){if(this.isFocus){this.handleDown();}},handleArrowUp:function(){if(this.isFocus){this.handleUp();}}},watch:{currentValue: function(val) {this.$emit(input,val);},value: function(val){this.updateValue(val);}}})const app new Vue({el:#app,data:{value:5}})
/script/body
/html参考《Vue.js实战》P98~P106
