JavaScript alert () function detailed instructions

Here is a brief introduction to the use of the JavaScript alert () function, the alert--pop-up message dialog box, and the Alert message dialog box is usually used for some informational messages to the user.

JavaScript alert () function

alert--Pop-up message dialog box (there is an OK button in the dialog box)

Alert, Chinese "reminder" means

Alert function syntax

alert (str);

alert function hint box diagram

Alert function argument

str--text to be displayed in the message dialog box

Alert function Description

The Alert message dialog box is typically used for some information about the user, such as when the wrong data is entered in the form.

Tip: The message dialog box is provided by the system, so the style font may be different in different browsers.

Tip: The message dialog box is exclusive, which means that no other action can be performed until the user clicks the button on the dialog box.

Tip: A message dialog box can often be used to debug a program.

Example

Alert ("hellodreamdu!");    Alert (' welcometo<br/>dreamdu! ');  　　Alert (' welcometondreamdu! '); Note that the second and third examples above, only a third example to implement line wrapping, reference to the ASCII table, using the BR tag in HTML can not wrap.