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<!DOCTYPE html> <html> <body> <h3>如何访问 PRE 元素的演示</h3> <pre id="myPre"> Text in a pre element is displayed in a fixed-width font, and it preserves both spaces and line breaks </pre> <p>点击按钮获取 pre 元素的 innerHTML。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myPre").innerHTML; document.getElementById("demo").innerHTML = x; } </script> </body> </html>