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• Try Catch
SAMPLE CODE <form onSubmit="testTryCatch();"> <!-- Please enter your last name. <br><br> --> <!-- <input type="text" id="lastNameField"> <br><br> --> <input type="submit" value="Submit Form"> </form> function testTryCatch() { try{ var greeting = "Hello world!"; aler(greeting); // this is the error to catch. It should say alert } catch(err) { alert(err); } }