Javascript中的自定义错误对象

Posted 2021-02-26

function ErrorConstructor(constructorName) {
  var errorConstructor = function(message, fileName, lineNumber) {
  // don't directly name this function, .name is used by Error.prototype.toString
    if (this == window) return new arguments.callee(message, fileName, lineNumber);
    this.name = errorConstructor.name;
    this.message = message||"";
    this.fileName = fileName||location.href;
    if (!isNaN(+lineNumber)) this.lineNumber = +lineNumber;
    else this.lineNumber = 1;
  }
  errorConstructor.name = constructorName||Error.prototype.name;
  errorConstructor.prototype.toString = Error.prototype.toString;
 
  return errorConstructor;
}
Usage: ErrorConstructor([constructorName])
 
Note: If no constructorName is specified, the default of Error.prototype.name is used
 
Usage for generated error constructor: errorConstructor([message[, location[, lineNumber]])
 
Examples:
 
var SecurityError = ErrorConstructor("Security Error"),
MarkupError = ErrorConstructor("(X)html Markup Error");
//these will both throw a SecurityError starting with "Security Error on line 83:"
var xss_error = "Possible XSS Vector
 JSON XHR response parsed with eval()
 Recommended fix: Parse JSON with JSON.parse";
throw new SecurityError(xss_error, "/js/searchResultsJSONloader.js", 83);
throw SecurityError(xss_error, "/js/searchResultsJSONloader.js", 83);
//these will both throw the following MarkupError:
//"(X)HTML Markup Error on line 1: Invalid DOCTYPE"
throw new MarkupError("Invalid DOCTYPE");
throw MarkupError("Invalid DOCTYPE");