<template>
  <span v-if="['', null, undefined].indexOf(content) === -1">
    <el-tooltip :content="content" effect="light" placement="bottom" popper-class="tooltip-box">
      <slot></slot>
    </el-tooltip>
  </span>
  <span v-else>
    <slot></slot>
  </span>
</template>

<script>
export default {
  name: "tooltipBox",
  props: {
    content: {
      type: String,
      default: "",
    },
  },
};
</script>

<style>
.tooltip-box.el-tooltip__popper .popper__arrow {
  /* 上方箭头 */
  border-top-color: #e8f4ff !important;
  /* 下方箭头 */
  border-bottom-color: #e8f4ff !important;
}

.tooltip-box.el-tooltip__popper .popper__arrow:after {
  border-top-color: #e8f4ff !important;
  border-bottom-color: #e8f4ff !important;
}

/* tooltip主体部分 */
.tooltip-box.el-tooltip__popper {
  color: #1890ff;
  background-color: #e8f4ff !important;
  border-color: #d1e9ff !important;
  box-shadow: 0px 0px 7px 0px rgba(42, 42, 42, 0.2) !important;
}
</style>

import tooltipBox from "./components/tooltipBox";

export default {
  components: {
    tooltipBox
  },
}

<el-table-column label="讲课内容" align="center" prop="lectureContent">
  <template slot-scope="scope">
    <tooltipBox :content="scope.row.lectureContent">
      <el-input v-model="scope.row.lectureContent"></el-input>
    </tooltipBox>
  </template>
</el-table-column>