Javascript 用typescript编写此开关/大小写的更好方法?
我正在Angular中开发一个非常简单的天气应用程序,我想问你是否认为有更好的方法根据天气编码的“类型”来选择特定的图像Javascript 用typescript编写此开关/大小写的更好方法?,javascript,angular,typescript,design-patterns,enums,Javascript,Angular,Typescript,Design Patterns,Enums,我正在Angular中开发一个非常简单的天气应用程序,我想问你是否认为有更好的方法根据天气编码的“类型”来选择特定的图像 enum WeatherCodition { Thunderstorm = 0, Drizzle, Rain, Snow, Clear, Clouds } export class Weather { getIcon(condition: WeatherCodition): string { va
enum WeatherCodition {
Thunderstorm = 0,
Drizzle,
Rain,
Snow,
Clear,
Clouds
}
export class Weather {
getIcon(condition: WeatherCodition): string {
var iconPath = "";
switch(condition){
case WeatherCodition.Thunderstorm:
iconPath = "thunderstorm.png";
break;
case WeatherCodition.Clouds:
iconPath = "clouds.png";
break;
case WeatherCodition.Drizzle:
iconPath = "drizzle.png";
break;
case WeatherCodition.Rain:
iconPath = "rain.png";
break;
case WeatherCodition.Snow:
iconPath = "snow.png";
break;
default:
iconPath = "clear.png"
}
return iconPath;
}
}
可以基于密钥创建对象和访问属性
let WeatherCodition={
雷雨:“雷雨.png”,
云:“clouds.png”,
毛毛雨:“drizzle.png”,
雨:“rain.png”,
雪:“snow.png”,
默认值:“clear.png”
}
函数getIcon(条件){
条件=条件| |“”
condition=Object.keys(WeatherCodition).find(c=>c.toLowerCase()==condition.toLowerCase())| |“默认”
返回天气编码[条件]
}
console.log(getIcon(“”))
log(getIcon('Clouds'))
console.log(getIcon())
log(getIcon('SnoW'))
您的方法非常好。您还可以在switch语句中对URL进行编码时,为固定时间查找创建hashmap
interface WeatherIcons {
Thunderstorm: string;
Clouds: string;
}
const icons: WeatherIcons = {
Thunderstorm: "Thunderstorm.jpg",
Clouds: "Clouds.jpg"
}
function getIcon(condition: WeatherCondition) {
return icons[condition] || "default.jpg";
}
为什么不定义一个数组
iconPaths:string[]=["thunderstorm.png","clouds.png","drizzle.png","rain.png","snow.png",
"clear.png"]
iconPath=this.iconPaths[condition];
//or
iconPath=(condition && condition<6)?this.iconPaths[condition]:"";
iconPath:string[]=[“雷雨.png”、“云.png”、“细雨.png”、“雨.png”、“雪.png”,
“clear.png”]
iconPath=this.iconPath[条件];
//或
ICONPATH =(条件&条件> P>请考虑使用<代码>接口键值< /代码>作为数组。我的解决方案:
export enum WeatherCodition {
Thunderstorm = 0,
Drizzle,
Rain,
Snow,
Clear,
Clouds
}
import { KeyValue } from '@angular/common';
export class Weather {
public keyValueArray: KeyValue<WeatherCodition, string>[] =
[
{ key: WeatherCodition.Thunderstorm, value: "thunderstorm.png" },
{ key: WeatherCodition.Drizzle , value: "drizzle.png"},
{ key: WeatherCodition.Rain, value: "rain.png" },
{ key: WeatherCodition.Snow, value: "snow.png" },
{ key: WeatherCodition.Clear, value: "clear.png" },
{ key: WeatherCodition.Clouds, value: "clouds.png" },
];
getIcon(condition: WeatherCodition): string {
//check if 'condition' exists in array as key
return this.keyValueArray[condition] ?
this.keyValueArray[condition].value :
"clear.png";
}
}
导出枚举天气编码{
雷暴=0,
下蒙蒙细雨
雨,
雪,
清楚的
云
}
从“@angular/common”导入{KeyValue};
出口级天气{
public keyValueArray:KeyValue[]=
[
{key:WeatherCodition.raundstorm,value:“reundstorm.png”},
{key:WeatherCodition.Drizzle,值:“Drizzle.png”},
{key:WeatherCodition.Rain,value:“Rain.png”},
{key:WeatherCodition.Snow,value:“Snow.png”},
{key:WeatherCodition.Clear,value:“Clear.png”},
{key:WeatherCodition.Clouds,value:“Clouds.png”},
];
getIcon(条件:WeatherCodition):字符串{
//检查数组中是否存在作为键的“条件”
是否返回此.keyValueArray[条件]?
此.keyValueArray[条件]。值:
“clear.png”;
}
}
祝您愉快!不,案例都是enum中的类型。现在我更改问题,抱歉。最好为WeatherCondition:ImageUrl映射提供一个hashmap。这样,您可以在固定时间内直接访问所需的图标。抱歉,您能为我提供相关文档吗?非常感谢。