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shop-app/common/plugins/enum.js

86 lines
1.8 KiB

3 years ago
/**
* 枚举类
* Enum.IMAGE.name => "图片"
* Enum.getNameByKey('IMAGE') => "图片"
* Enum.getValueByKey('IMAGE') => 10
* Enum.getNameByValue(10) => "图片"
* Enum.getData() => [{key: "IMAGE", name: "图片", value: 10}]
*/
class Enum {
constructor (param) {
const keyArr = []
const valueArr = []
if (!Array.isArray(param)) {
throw new Error('param is not an array!')
}
param.map(element => {
if (!element.key || !element.name) {
return
}
// 保存key值组成的数组方便A.getName(name)类型的调用
keyArr.push(element.key)
valueArr.push(element.value)
// 根据key生成不同属性值以便A.B.name类型的调用
this[element.key] = element
if (element.key !== element.value) {
this[element.value] = element
}
})
// 保存源数组
this.data = param
this.keyArr = keyArr
this.valueArr = valueArr
// 防止被修改
// Object.freeze(this)
}
// 根据key得到对象
keyOf (key) {
return this.data[this.keyArr.indexOf(key)]
}
// 根据key得到对象
valueOf (key) {
return this.data[this.valueArr.indexOf(key)]
}
// 根据key获取name值
getNameByKey (key) {
const prop = this.keyOf(key)
if (!prop) {
throw new Error('No enum constant' + key)
}
return prop.name
}
// 根据value获取name值
getNameByValue (value) {
const prop = this.valueOf(value)
if (!prop) {
throw new Error('No enum constant' + value)
}
return prop.name
}
// 根据key获取value值
getValueByKey (key) {
const prop = this.keyOf(key)
if (!prop) {
throw new Error('No enum constant' + key)
}
return prop.key
}
// 返回源数组
getData () {
return this.data
}
}
export default Enum