判断el-input和el-input-number绑定的值是否为空

判断el-input是否为空

<el-input placeholder="措施:" v-model="radarECCM" class="bt1-text1-input"></el-input>

if (this.radarECCM == "") {
   this.$alert(不能为空");
}

判断el-input-number是否为空：

<el-input-number placeholder="频段:" v-model="radarRFBand" class="bt1-text1-input-number" :precision="2"></el-input-number>

if (typeof this.radarRFBand == "undefined") {
    this.$alert("不能为空");
}