<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>数字输入框</title>
<script type="text/javascript" src="js/lib/vue.js"></script>
<script type="text/javascript" src="js/input-test-num.js"></script>
</head>
<body>
<div id="app">
{{value}}
<number-input v-model="value" :max="10" :min="-10" :step="2"></number-input>
</div>
</body>
<script type="text/javascript">
function isValueNumber(value){
return (/(^-?[0-9]+.{1}d+$)|(^-?[1-9][0-9]*$)|(^-?0{1}$)/).test(value);
}
var app = new Vue({
el:'#app',
data:{
value:0
}
});
</script>
</html>
JS:input-test-num.js
Vue.component('number-input',{
// 定义来自父级的参数
props:{
max:{
type:Number,
default:Infinity
},
min:{
type:Number,
default:-Infinity
},
value:{
type:Number,
default:0
},
step:{
type:Number,
default:1
}
},
template:'
<div>
<input type="text" :value="currentValue" @change="handleChange" @keydown="handleKeydown" />
<button @click="handleAdd" :disabled="currentValue>=max"> ADD </button>
<button @click="handleReduce" :disabled="currentValue<=min"> Reduce </button>
</div>',
data:function(){
// Vue组件是单向数据流，无法直接修改prop中的值
var currentValue = 0 ;
if(this.value > this.max){
currentValue = this.max ;
} else if(this.value < this.min){
currentValue = this.min ;
} else{
currentValue = this.value ;
}
return {
currentValue :currentValue
}
},
methods:{
handleChange:function(event){
var val = event.target.value.trim() ;
if(isValueNumber(val)){
var max = this.max ;
var min = this.min ;
val = Number(val);
this.currentValue = val ;
if(val>max) this.currentValue = max ;
if(val<min) this.currentValue = min ;
}else{
// 如果输入的非数字，则保留之前的数据
event.target.value = this.currentValue ;
}
},
// 绑定键盘事件
handleKeydown:function(event){
if(event.keyCode==38){
this.handleAdd();
}
if(event.keyCode==40){
this.handleReduce() ;
}
},
handleAdd:function(){
if(this.currentValue>=this.max) return ;
this.currentValue += this.step ;
},handleReduce:function(){
if(this.currentValue<=this.min) return ;
this.currentValue -= this.step;
},
updateVal:function(val){
if(val>this.max) val = this.max ;
if(val<this.min) val = this.min ;
this.currentValue = val ;
}
},
watch:{
// 增加监听
currentValue:function(val){
this.$emit('input',val);
this.$emit('on-change',val);
},
value:function(val){
this.updateVal(val);
}
}
})
！可根据自己情况增加样式