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<!DOCTYPE html> <html> <body> <script id="myFirstScript"> document.write("Hello World!"); </script> <p>单击该按钮可显示文档中每个脚本元素的 ID。</p> <button type="button" onclick="myFunction()">试一试</button> <p id="demo"></p> <script id="mySecondScript"> function myFunction() { var x = document.scripts; var txt = ""; var i; for (i = 0; i < x.length; i++) { txt = txt + x[i].id + "<br>"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>