自定义JavaScript Error类代码

自定义JavaScript Error类代码，有了这段代码就可以自定义js代码处理的方式

var http = require('http');
 
// Http错误
function HttpError(code, msg) {
    Error.captureStackTrace(this, arguments.callee);
    this.name = arguments.callee.name;
 
    var status = http.STATUS_CODES;
 
    if (!code || !(code in status))
        code = 500;
 
    if (!msg)
        msg = status[code];
 
    this.message = msg;
    this.code = code;
}
 
HttpError.prototype = Object.create(Error.prototype);