html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>数字输入框</title>
</head>
<body>
<div id="app">
<input-number v-model="value" :max="10" :min="0" :step="1"></input-number>
</div>
<script src="https://unpkg.com/vue/dist/vue.min.js"></script>
<script src="input-number.js"></script>
<script>
var app = new Vue({
el: "#app",
data: {
value: 5
}
})
</script>
</body>
</html>
input-number.js:
function isValueNumber(value){
return (/(^-?[0-9]+\.{1}\d+$)|(^-?[1-9][0-9]*$)|(^-?0{1}$)/).test(value+'');
}
Vue.component('input-number',{
template: '<div class="input-number"><input type="text" :value="current" @change="inputChange" @keyup.up="reduce" @keyup.down="increase"><button @click="reduce" :disabled="current <= min">-</button><button @click="increase" :disabled="current >= max">+</button></div>',
props: {
value: {
type: Number,
default: 0
},
max: {
type: Number,
default: Infinity
},
min: {
type: Number,
default: -Infinity
},
step: {
type: Number,
default: 10
}
},
data: function () {
return {
current: this.value
}
},
methods: {
reduce: function () {
this.current --;
},
increase: function () {
this.current +=this.step;
},
inputChange: function (event) {
var val = event.target.value.trim();
if(isValueNumber(val)){
val = Number(val);
this.updataValue(val);
}else{
event.target.value = this.currentValue;
}
},
updataValue: function (val) {
if(val >= this.max){
val = this.max;
}else if(val <= this.min){
val = this.min;
}
this.current = val;
}
},
watch: {
current: function (val) {
this.$emit('input',val);
},
value: function (val) {
this.updataValue(val);
}
}
})效果：