Prompt the user to enter 2 values in turn through the prompt box, and pop up the maximum value entered by the user after the user input is completed;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title></title>
</head>
<body>
<script>
var num1 = Number ( prompt ( ' Please enter the first number ' ));
// 2. Declare the second variable and input the data
var num2 = Number ( prompt ( ' Please enter the second number ' ));
// 3. Determine who is older and who is younger
if (num1 > num2) {
// If true, output the second number
console.log ( ' The maximum value is : ' + num1 ) ;
} else {
// If false, output the first number
console.log ( ' The maximum value is : ' + num2 ) ;
}
</script>
</body>
</html>
var num=Number(prompt('Please enter a number')): Use Number() to convert the data type. Because the data entered by the prompt is a string type by default, if you want to change it into a number type, you need to convert the data type; if you don’t know what data type to convert to, use Number().
parseInt() is converted to an integer type
parseFloat() is converted to a floating point number
Number() is converted to a numeric type.