element自定义el-dialog标题，加图标_el-dialog如何给他的header加个标签

template中

<el-dialog :visible.sync="dialogTableVisible">
  <div slot="title" class="dialog-title">
    <i class="el-icon-edit-outline"></i>
    <span class="title-text">数据详情</span>
    <div class="button-right">
      <span class="title-close" @click="cancel"></span>
    </div>
  </div>
  <el-table :data="gridData">
    <el-table-column property="date" label="日期" width="150"></el-table-column>
    <el-table-column property="name" label="姓名" width="200"></el-table-column>
    <el-table-column property="address" label="地址"></el-table-column>
  </el-table>
</el-dialog>
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data中

data () {
	retrun: {
		dialogTableVisible: false,
		gridData: []
	}
}
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methods中：

methods: {
	cancel () {
		this.dialogTableVisible = false
	}
}
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style中：

<style>
.dialog-title {
    text-align: left;
    font-size: 14px;
    font-weight: 700;
    overflow: hidden;
  }
  .dialog-title i {
    color: #45A4F9;
    /* color: #0B2278; */
    font-size: 16px;
    line-height: 38px;
  }
  .dialog-footer {
    text-align: left;
    font-size: 14px;
    font-weight: 700;
  }
</style>
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