​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 字符串</h1>
​
<p>字符串写在单引号或双引号内：</p>
​
<p id="demo"></p>
​
<script>
let carName1 = "Volvo XC60";  // 双引号
let carName2 = 'Volvo XC60';  // 单引号
​
document.getElementById("demo").innerHTML =
carName1 + " " + carName2; 
</script>
​
</body>
</html>
​