node js express exception handling

Details about the event processing mechanism in node. js EventEmitter class The EventEmitter class is defined in the event module used by Node. js to implement various event processing. All objects that may trigger the event are instance objects that integrate EventEmitter classes. in

In JavaScript, you can use Try...catch for exception handling. For example: Copy Code code as follows: try {foo.bar ();} catch (E) {alert (e.name + ":" + E.message);} At present, we may get the system anomaly mainly contains the following 6 kinds: evalerror:raised when a error occurs executing code in eval () rangeerror:raised when a numeric variable or parameter be outside of its v

The first common sense is that in the browser to execute the JS script, when there is a script error, and you do not manually do the exception capture, he will appear in the browser yellow exclamation mark, it is normal, this is not the most important, most importantly, the error line below all the JS code will be stopped execution, This is what we do not want to

The first common sense is that, in the browser to execute the JS script, when there is a script error, and you do not manually catch the exception, he will appear under the browser yellow exclamation mark, which is normal, this is not the most important, the most important thing, the following error line of all JS code will be stopped execution, This is what we d