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Three kinds of prompt boxes
- alert ()
- confirm()
- prompt ()
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 ：
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 ：
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 ：
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