multiple表示多选，:multiple-limit=“1” 限制多选的条数为1，2就是选两个，依此类推。为0 就是不限制选几个
使用 allow-create 属性即可通过在输入框中输入文字来创建新的条目。注意此时 filterable 必须为真。

  <el-form :inline="true" :model="form" class="demo-form-inline"><el-select v-model="form.properties_id" style="width: 300px" placeholder="请选择样品性质" filterable clearable multiple @change="getData()" :multiple-limit="limit_properties"><el-option v-for="item in sample_properties" :label="item.label" :value="item.value" :key="item.value"></el-option></el-select></el-form-item><el-form-item><el-select v-model="form.place_id" style="width: 300px" placeholder="请选择品名" filterable clearable multiple @change="getData()" :multiple-limit="limit_place"><el-option v-for="item in place_data" :label="item.label" :value="item.value" :key="item.value"></el-option></el-select></el-form-item></el-form>

    data() {return {sample_properties:@json($sample_properties),place_data:@json($place_data),form: {properties_id : [],place_id      : [],},limit_properties : 0,limit_place : 0,}},methods: {getData(){var that = thisif(that.form.properties_id.length>1 && that.form.place_id.length<=1)						{that.limit_properties= 0 //没限制that.limit_place= 1 //限制1条}if(that.form.place_id.length>1 && that.form.properties_id.length<=1){that.limit_properties= 1that.limit_place= 0}if(that.form.place_id.length==1 && that.form.properties_id.length==1){that.limit_properties= 0that.limit_place= 0}//......},},