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1.字符串可以是引号中的任意文本，可以使用单引号或双引号。可以在字符串中使用引号，只要不匹配包围字符串的引号即可。
<!DOCTYPE html>
<html>
<body>
<script>
var carname1="Bill Gates";
var carname2='Bill Gates';
var answer1="Nice to meet you!";
var answer2="He is called 'Bill'";
var answer3='He is called "Bill"';
document.write(carname1 + "<br>")
document.write(carname2 + "<br>")
document.write(answer1 + "<br>")
document.write(answer2 + "<br>")
document.write(answer3 + "<br>")
</script>
</body>
</html>
2.字符串的连接
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
var str1 = "What a very";
var str2 = "nice day!";
var str3 = str1+str2;
document.write(str3);
</script>
</head>
<body>
</body>
</html>
要想在两个字符串之间增加空格，需要把空格插入一个字符串之中：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
var str1 = "What a very ";
var str2 = "nice day!";
var str3 = str1+str2;
document.write(str3);
</script>
</head>
<body>
</body>
</html>
或者把空格插入表达式中：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
var str1 = "What a very";
var str2 = "nice day!";
var str3 = str1+" "+str2;
document.write(str3);
</script>
</head>
<body>
</body>
</html>
3.把数字与字符串相加，结果将成为字符串
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
var str1 = 5+"5";
document.write(str1);
</script>
</head>
<body>
</body>
</html>
