SOURCE

new Vue({
    el: '#app',
    data: {
        cash3: '',
        cash4: '',
        cash5: '',
    },
    methods: {
        onInput5 (ev) {
            this.cash5 = window.sUtils.rgAllowInteger(ev.target.value, 5)
        },
        onInput3 (ev) {
            this.cash3 = window.sUtils.rgAllowInteger(ev.target.value, 3, '+')
        },
        onInput4 (ev) {
            this.cash4 = window.sUtils.rgAllowInteger(ev.target.value, 4, '-')
        }
    },
    template: `
        <div>
            <h2>Vue当中测试整型输入限制</h2>
            <label>最多不超过5位的正负整数：</label>
            <input v-model="cash5" @input="onInput5" />
            <hr>
            <label>最多不超过3位的正整数：</label>
            <input v-model="cash3" @input="onInput3" />
            <hr>
            <label>最多不超过4位的负整数：</label>
            <input v-model="cash4" @input="onInput4" />
        </div>
    `
})

<div id="app"></div>