js中的字串
阿新 • • 發佈:2018-11-08
1.字串可以是引號中的任意文字,可以使用單引號或雙引號。可以在字串中使用引號,只要不匹配包圍字串的引號即可。
<!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.字串的連線
<!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>
要想在兩個字串之間增加空格,需要把空格插入一個字串之中:
<!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>
或者把空格插入表示式中:
<!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.把數字與字串相加,結果將成為字串
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
var str1 = 5+"5";
document.write(str1);
</script>
</head>
<body>
</body>
</html>