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求解： typescript 如何根据 enum 的字符值返回对应的 enum 实例？
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比如定义以下 enum
const enum VerticalAlign {
bottom, center, top
}
定义下面方法
//data 是后台返回的数据
function getVerticalAlign(data:JsonData):VerticalAlign {
let value:string|null = data['vAlign'];
switch(value) {
case VerticalAlign.bottom:
return VerticalAlign.bottom;
........
}
}
现在的写法就是每个 enum 的值都要判断一次然后返回，有通用的方法返回一个 enum 的值么，直接写 VerticalAlign[value] 编译器报错.
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