JS实现全选，取消全选，正常选择

//点击选择方法

onUserIdsChange(selVal) {

if (this.form.groupUserIds.includes(-1) && !this.isSelectAll) {

// 全选

this.nickNames = []

this.isSelectAll = true

this.form.groupUserIds = []

this.groupUserOption.forEach(item => {

item.value != -1 && this.form.groupUserIds.push(item.value)

if(this.form.groupUserIds.length !== 0 && item.subscribe !== true){

this.onShow = true

this.nickNames.push(item.label)

}

})

this.groupUserOption[0].label = '取消全选'

} else if (this.isSelectAll && this.form.groupUserIds.includes(-1)) {
**// 取消全选**
this.isSelectAll = false
this.groupUserOption[0].label = '全选'
this.form.groupUserIds = []
this.onShow = false
this.nickNames = []
} else {
**// 正常选择**
this.nickNames = []
this.form.groupUserIds = selVal
if(this.form.groupUserIds.length === this.groupUserOption.length - 1){
this.groupUserOption[0].label = '取消全选'
}else{
this.groupUserOption[0].label = '全选'
}
if(this.form.groupUserIds.length !== 0){
this.groupUserOption.forEach(item2 => {
this.form.groupUserIds.forEach(item => {
if(item2.value === item && item2.subscribe !== true){
this.onShow = true
this.nickNames.push(item2.label)
}else if(item2.value === item && item2.subscribe === true){
this.onShow = false
}
})
})
}
else{
this.onShow = false
this.nickNames = []
}
}
}
},