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<!DOCTYPE html> <html> <body> <h2>JavaScript 语句</h2> <p><b>JavaScript 程序</b> 是要由计算机执行的<b>语句</b> 列表。</p> <p id="demo"></p> <script> var x, y, z; // Statement 1 x = 5; // Statement 2 y = 6; // Statement 3 z = x + y; // Statement 4 document.getElementById("demo").innerHTML = "z 的值为 " + z + "."; </script> </body> </html>