1 JS三种书写位置
1.1 行内式的js
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="id=edge"> <title>Document</title> </head> <body> <!-- 1.行内式的js,直接写到元素的内部 --> <input type="button" value="test" onclick="alert('onclick')"> </body> </html>
1.2 内嵌式的js
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="id=edge"> <title>Document</title> <!-- 2.内嵌式的js --> <script> alert('test'); </script> </head> <body> </body> </html>
1.3 外部js
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="id=edge"> <title>Document</title> <!-- 3.外部的js script双标签 --> <script src="my.js"></script> </head> <body> </body> </html>
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