el-input限制输入小数，且小数位数最多两位

 <el-input size="mini" v-model="searchData.weight" type="number" @input="validateNumber"  class="search_val"> </el-input>

 validateNumber (value) {
     const reg = /^\d+(\.\d{1,2})?$/
     if (!reg.test(value)) {
       this.searchData.weight = value.substring(0, value.length - 1)
     }
 },