&&多条件,当其中一个不符合true条件时,返回该条不符合条件的值
<div :class="['zrx-drop-tree', dropped && 'focus']" tabindex="-1" :disabled="disabled" @focusout="onExternalOut" :clearable="canClearable" ref="container">
</div>
computed:{
canClearable() {
return this.clearable && Boolean(this.selectedNodes.length) && !this.disabled
}
}