1.找到要使用图标的Unicode字符

2.代码中添加

.el-form-item__error:before {
            content: '\f06a';
            font-family: FontAwesome; //FontAwesome图标
 }
&::after {
                content: '\e60b';
                font-family: "iconfont"; //iconfont 图标
                position: absolute;
                font-size: 16px;
                width: 34px;
                height: 34px;
                color: #fff;
                right: -5%;
                top: 5%;
            }