Three pop-up prompt boxes of JavaScript (alert, confirm, prompt)

osc_y65eb2q 2020-11-11 11:46:25
pop-up pop prompt boxes javascript


Three kinds of prompt boxes

alert ()

alert() The method is to display a warning box with a prompt message and a confirmation button .
It should be noted that :alert() It's a blocking function , If we don't click the confirm button , The latter will not be loaded .

Usage mode :

alert(" The text you want to prompt ")

Sample code :

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
alert(" This is the pop-up prompt text ")
</script>
<title></title>
</head>
<body>
<p>alert It's a blocking function </p>
<p> This sentence will only be displayed after confirming the prompt text in the pop-up box </p>
</body>
</html>

Effect screenshots :

 Insert picture description here

confirm()

confirm() The method is to display a confirmation box with the specified message and the confirm and Cancel buttons .
If you click " determine " return true, Otherwise return to false.

Usage mode :
Do not receive return value :

confirm(" Writing this way can directly show , Do not receive return value .")

Receive return value :

var x;
var r=confirm(" Please press the button !");
if (r==true){
x=" What you press is \" determine \" Button .";
}
else{
x=" What you press is \" Cancel \" Button .";
}
document.write(x)

Sample code :

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
// Usage 1 
confirm(" Writing this way can directly show , Do not receive return value .")
// Mode 2 
var x;
var r=confirm(" Please press the button !");
if (r==true){

x=" What you press is \" determine \" Button .";
}
else{

x=" What you press is \" Cancel \" Button .";
}
document.write(x)
</script>
<title></title>
</head>
<body>
</body>
</html>

Effect screenshots :
 Insert picture description here

prompt ()

prompt() The method is to display a dialog box that prompts the user to input .
This method returns the string entered by the user .

Usage mode :

Do not display default text :

prompt(" Happy? ?"); // This display can also be left blank , But there's no point in interaction .

Show default text :

var x;
var name=prompt(" Please enter your name ","Keafmd");
if (name!=null && person!=""){
x=" Hello ! " + name + ".";
document.write(x)
}

Sample code :

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
// Mode one 
prompt(" Happy? ?"); // This display can also be left blank , But there's no point in interaction .
// Mode two 
var x;
var name=prompt(" Please enter your name ","Keafmd"); // Show default text "Keafmd"
if (name!=null && name!=""){

x=" Hello ! " + name + ".";
document.write(x)
}
</script>
<title></title>
</head>
<body>
</body>
</html>

Effect screenshots :
 Insert picture description here
Writing is not easy to , After reading it, if it helps you , Thank you for your support !
If you're on the computer side , See... In the lower right corner “ One key, three links ” Did you? , That's right. Point it [ ha-ha ]

 Insert picture description here


come on. !

Joint efforts !

Keafmd

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