一、CSS

        1、属性可安全的替换为速记形式

	.el-dialog .el-dialog__header + .el-dialog__body {padding: 0 40px;padding-top: 4px;}.el-dialog .el-dialog__header + .el-dialog__body {padding: 4px 40px 0;}

        2、度量单位冗余

padding: 0px 20px;// 修改后
padding: 0 20px;

        3、字体属性font-family 没有通用默认值

font-family: PingFangSC, PingFangSC-Semibold;// 修改之后
font-family: PingFangSC, PingFangSC-Semibold,serif;

        4、无效的元素

        无效的伪类选择器

    ::v-deepimg.el-tooltip {margin-bottom: 0px;}::v-deep .el-table__body-wrapper::-moz-scrollbar {width: 6px;height: 10px;}::v-deep .el-table__body-wrapper::-moz-scrollbar-thumb {background-color: #ddd;border-radius: 3px;}

无效的属性值

<i class="el-icon-warning" style="color:#00C3AC;font-size:16px,margin-top:5px"></i>.el-select-dropdown__item {align-items: top;white-space: wrap;transition: 0.2;margin-right: 12px 12px 12px 0;padding: 6px auto;color: 2e3440;font-weight: Medium;
}.onlineItemDisable:hover {white-space: nowarp;font-weight: 500px;cursor: non-allowed;align-items: left;margin: 20px 18px 12px 180x;left: 160;box-shadow: 0, 2px, 12px, 0;
}

5、覆盖的属性

.el-icon-my-hide {background: url("~@/assets/img/icon_screen.png") no-repeat;background-repeat: no-repeat;background-position: center;height: 36px;width: 36px;
}

6、未知的HTML标签

<!-- 既不import，也不使用 -->
<registry-dialog/>

二、语法

// 变量已分配给自己
this.step = this.step > 3 ? (this.step = 3) : (this.step = this.step);// ？
<el-card class="main_content" style="125px">
<div style="height: 260px; width: "></div>
<img style="margin-bottom;: 2px" class="miniIcon" src="@/assets/img/add_2x.png" />