el-input 金额校验
<el-input v-model="pitem.cheapPayMoney" :placeholder="`最大输入金额为${pitem.maxcheapPayMoney}元`" class="table-input" type="number" step="0.01" onkeyup="if(isNaN(value)||value<0){value =''}if(value.indexOf('.')<0){value=parseFloat(value)}if(value.indexOf('.')>0){value=value.slice(0,value.indexOf('.')+3)}" :oninput="`if(value>${pitem.maxcheapPayMoney})value=${pitem.maxcheapPayMoney}`" :disabled="cheapdisabled" @input="cheapPrice" />