overflow:hidden;white-space:nowrap;text-overflow:ellipsis;

overflow:hidden:超出隐藏
white-space:nowrap:强制不换行
text-overflow:ellipsis:超出省略号代替;

Portal, go check it out

Fixed approach requires the following four conditions:
1. Fixed width
2.overflow:hidden
3.white-space:nowrap
4.text-overflow:ellipsis

 display: -webkit-box;
    box-orient: vertical;
    line-clamp: 3; // 可控制几行后有 ... 
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3; // 兼容写法
    overflow: hidden;
    white-space:normal;

First of all, the first point is that the line needs to be given a fixed width. Even if the width is not given, the line needs to be limited by margin. To put it bluntly, it is to give the line a fixed width. . .
Other codes are as follows

如果是一个p标签
p{
    width:100px;//固定宽度
    overflow:hidden;//超出隐藏
    white-space:nowrap;//不换行
    text-overflow:ellipsis;//省略号
}

/a/11...
Two implementation methods, fixed width, excess display..., mouse hover to omit content

// line-clamp、line-height和height直接控制多行
.two-line {
    color: #333;
    line-height: 18px;
    height: 36px;
    overflow : hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    display: -moz-box;
    -webkit-line-clamp: 2;
    -moz-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    -moz-box-orient: vertical;
    box-orient: vertical;
  }

With fixed width, use overflow:hidden;text-overflow:ellipsis;white-space:nowrap;