ElementUI中el-radio再次点击取消选中

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方法:

<el-radio-group v-model="isContain" >
    <el-radio @click.native.prevent="checkClick(1)" :label="1">包含</el-radio>
    <el-radio @click.native.prevent="checkClick(0)" :label="0">不包含</el-radio>
</el-radio-group>
checkClick (e) {
   e === this.isContain ? this.isContain = '' : this.isContain = e;
},