使用三目运算符替代
<transition name='el-fade-in-linear' appear={true}>
<span class='e-filter-btn'>
<i class={[
'e-filter-tag',
_this.filterLoads.some((fl) => fl === colKey)? "el-icon-loading" : '',
!_this.filterLoads.some((fl) => fl === colKey)? "el-icon-arrow-down" : ''
]}>
</i>
</span>
</transition>