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What are the three output methods of JavaScript?
- 青灯夜游Original
- 2021-11-24 14:07:445329browse
Three output methods of JavaScript: 1. Pop up a warning box for output, the syntax is "alert("output information")"; 2. Console output, the syntax is "console.log("output information")" ;3. Browser visible area output, syntax "document.write("output information")".
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
Three output methods of JavaScript
1. alert(year) pops up a warning box
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
// 定义一个变量 存储一个人的年龄
var year = 23;
alert(year)
</script>
</body>
</html>
2. console.log() console output
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
// 定义一个变量 存储一个人的年龄
var year = 23;
console.log(year);
</script>
</body>
</html>Console after pressing F12
3. Output document.write() to the browser’s visible area
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
// 定义一个变量 存储一个人的年龄
var year = 23;
document.write(year)
</script>
</body>
</html>
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