// 全选
val为组件绑定的值
term为绑定对象的key
optionsArr为下拉框数据
str为下拉框绑定的value值是id还是其他值
（需要在el-form中绑定ref）
方法代码
selectAll(val, term, optionsArr, str) {
const allValues = []
let checkArr = val
for (const item of optionsArr) {
allValues.push(item[str])
}
// oldSearchBankType为之前选择的值
let oldVal = this.oldSearchBankType.length === 1 ? this.oldSearchBankType : []
// 旧值无全选 新值有全选
if (val.includes('全选') || (!this.oldSearchBankType.includes('全选') && val.includes('全选'))) {
console.log(allValues)
checkArr = allValues
oldVal = checkArr
}
// 旧值有全选 新值无全选
if (this.oldSearchBankType.includes('全选') && !val.includes('全选')) {
checkArr = []
oldVal = checkArr
}
// 都有全选
if (this.oldSearchBankType.includes('全选') && val.includes('全选')) {
if (val.length === 1) {
checkArr = []
} else {
const index = val.indexOf('全选')
val.splice(index, 1) // 排除全选选项
checkArr = val
}
oldVal = checkArr
}
// 都没全选
if (!this.oldSearchBankType.includes('全选') && !val.includes('全选')) {
if (val.length === allValues.length - 1) {
checkArr = ['全选'].concat(val)
oldVal = checkArr
}
}
this.$refs['refNoPassLook'].model[term] = checkArr
this.oldSearchBankType = oldVal
}
