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<el-table-column type="selection" width="55"  label-class-name="DisabledSelection" :reserve-selection="true"></el-table-column>

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/*表格全选框去除空框*/

.el-table >>> .DisabledSelection .cell .el-checkbox__inner {

  display: none;

  position: relative;

}

/*表格全选框改为：选择*/

.el-table >>> .DisabledSelection .cell:before {

  content: "选择";

  position: absolute;

  left: 7px;

}