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<!DOCTYPE html> <html> <body> <h2>JavaScript For 循环</h2> <p>从 1 到 6 循环，生成 HTML 标题。</p> <div id="demo"></div> <script> var x ="", i; for (i=1; i<=6; i++) { x = x + "<h" + i + ">Heading " + i + "</h" + i + ">"; } document.getElementById("demo").innerHTML = x; </script> </body> </html>