三元运算符、三目运算符、判断四层、判断多层

 <div class="index"
 :class="row.data.index == 01 ? 'first' : 
 (row.data.index == 02 ? 'second':(row.data.index == 03 ? 'third':'normal'))"
 >
      {
    
    {
    
    row.data.index}}
 </div>