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This article mainly explains "how to write JavaScript dialog box". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to write JavaScript dialog box".

Warning box

Syntax:

Alert (string or variable)

Example:

Var mynum = 30; alert ("hello!"); alert (mynum)

Alert will pop up the message dialog box and pop up the message box in order.

Note: no other operations are allowed until you click the confirm button. Can be used to debug a program, and the output can be a string or variable.

Confirmation box

Syntax:

Confirm (str)

Parameter description

Str: text to be displayed in the message dialog return value: Boolean value

Return value

Return to true when the user clicks the OK button and return to false when the user clicks the cancel button

Example:

Var mymessage=confirm ("do you like JavaScript?"); if (mymessage==true) {[xss_clean] ("good, come on!");} else {[xss_clean] ("JS is powerful, need to learn!");} question box

Syntax:

Prompt (str1, str2)

Parameter description:

Str1: the text to be displayed in the message dialog box cannot be modified. The contents of the str2: text box can be modified

Return value:

1. Click the OK button, and the contents of the text box will return the value 2. 0 as a function. Click the cancel button and you will return to null

Example:

Var myname=prompt ("Please enter your name:"); if (Mynameqi dialog null) {alert ("Hello" + myname);} else {alert ("Hello my friend.");} Thank you for your reading, the above is the content of "how to write the JavaScript dialog box". After the study of this article, I believe you have a deeper understanding of how to write the JavaScript dialog box, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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