快速解决element中el-dialog弹框组件垂直居中问题的方法：https://blog.csdn.net/Shids_/article/details/120728973
::v-deep .el-dialog{
display: flex;
flex-direction: column;
margin:0 !important;
position:absolute;
top:50%;
left:50%;
transform:translate(-50%,-50%);
max-height:calc(100% - 30px);
max-width:calc(100% - 30px);
}
::v-deep .el-dialog .el-dialog__body{
flex:1;
overflow: auto;
}