初学者js的问题
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>switch</title>
<script type="text/JavaScript">
function liang()
{
var myweek =document.getElementById("bian").value;
switch(myweek)
{
case 1:
case 2:
document.write("学习理念知识");
break;
case 3:
case 4:
document.write("到企业实践");
break;
case 5:
document.write("总结经验");
break;
case 6:
case 7:
document.write("周六、日休息和娱乐");
break;
default:
document.write("输入出错");
}
}
</script>
</head>
<body>
<input id="bian" type="text" name="grade" ><br>
<input type="button" value="点吧" onclick="liang()">
</body>
</html>
为什么框里写什么，都是显示错误。
芝士君浏览 1500回答 2
2回答
-
Perona
从页面获取的都是字符串，2种解决方法：把case后的值加上引号，变成字符串型，如：<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>switch</title> <script type="text/JavaScript"> function liang() { var myweek =document.getElementById("bian").value; switch(myweek) { case '1': case '2': document.write("学习理念知识"); break; case '3': case '4': document.write("到企业实践"); break; case '5': document.write("总结经验"); break; case '6': case '7': document.write("周六、日休息和娱乐"); break; default: document.write("输入出错"); } } </script> </head> <body> <input id="bian" type="text" name="grade" ><br> <input type="button" value="点吧" onclick="liang()"> </body> </html> 2.把获取的值转换成整型，如：var myweek =parseInt(document.getElementById("bian").value); -
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Html/CSS
JavaScript