https://blog.csdn.net/qq_41619567/article/details/100040446
style三元表达式
<p :style="{'color': (checkIndex3==m.txt ? '#3d8cff':'#BBBBBB')}">{{m.txt}}</p>
class三元表达式
<i class="iconfont" :class="[isShow=='password'?'icon-kejian':'icon-bukejian']"></i>
