<html><body><h2>JavaScript 字符串</h2><p>字符串写在引号内。 您可以使用单引号或双引号：</p><p id="demo"></p><script>var carName1 = "Volvo XC60"; // Double quotesvar carName2 = 'Volvo XC60'; // Single quotesdocument.getElementById("demo").innerHTML =carName1 + " " + carName2; </script></body></html>