JavaScript Exception capture Notes

Exception capture

1. Abnormal

When the JavaScript engine executes the JavaScript code, an error occurs, causing the program to stop running

2. Exception throws

When an exception is generated and the exception is generated with an error message

3. Abnormal capture

try{

The code block in which the exception occurred;

}catch (Err) {

Error information processing;

}

Function Demo () {Try{alert (str);} catch (Error) {Console.log (error);//==>REFERENCEERROR:STR is not defined (...)}} Demo (); Custom error: Function Demo () {try{if (str== "") {throw "str is empty"; }}catch (Error) {Console.log (error);//==>str is empty}}demo ();

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JavaScript Exception capture Notes