.el-dialog弹窗垂直居中（重点：：兼容IE）

.el-dialog{
    display: flex;
    display: -ms-flex; /* 兼容IE */
    flex-direction: column;
    -ms-flex-direction: column; /* 兼容IE */
    margin:0 !important;
    position:absolute;
    top:50%;
    left:50%;
    transform:translate(-50%,-50%);
    max-height:calc(100% - 30px);
    max-width:calc(100% - 30px);
  }
.el-dialog .el-dialog__body{
    max-height: 100%;
    flex: 1;
    -ms-flex: 1 1 auto; /* 兼容IE */
    overflow-y: auto;
    overflow-x: hidden;
}

.el-dialog__wrapper {
    /*隐藏ie和edge中遮罩的滚动条*/
    overflow: hidden;
}