在 js 中捕获自定义异常

Question

如果我关注

function ValidationException(nr, msg){
   this.message = msg;
   this.name = "my exception";
   this.number = nr;
}
function myFunction(dayOfWeek){
   if(dayOfWeek > 7){
      throw new ValidationException(dayOfWeek, "7days only!");
   }
}

问题是： 我怎样才能在 catch 块中捕获这个特定的异常？

Answer 1

JavaScript does not have a standardized 捕捉不同类型异常的方式；但是，您可以执行常规 catch，然后检查 catch 中的类型。例如：

try {
    myFunction();
} catch (e) {
    if (e instanceof ValidationException) {
        // statements to handle ValidationException exceptions
    } else {
       // statements to handle any unspecified exceptions
       console.log(e); //generic error handling goes here
    }
}