点击运行
<!DOCTYPE html> <html> <body> <h1>JavaScript 数字</h1> <p>如果添加两个数字字符串，结果将是级联字符串：</p> <p id="demo"></p> <script> var x = "10"; var y = "20"; var z = x + y; document.getElementById("demo").innerHTML = z; </script> </body> </html>
运行结果
