Javascript: String对象,将字符串“hAPPY,i'm a student,NOW”中的大写字母转换成小写字母，小写字母转换成大写字母


答案：写了一下，你试试看
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns=" http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script language="javascript">
function test(){
 var temp = "hAPPY,i'm a student,NOW";
 var temp1 = "";
 for(var i=0; i<temp.length; i++){
  var ch = temp.charAt(i);
  var as = temp.charCodeAt(i);
  if(65<=as&&as<=90){
   temp1+=ch.toLowerCase();
  }else if(97<=as&&as<=122){
   temp1+=ch.toUpperCase();
  }else{
   temp1+=ch;
  }
 }
 alert("前"+temp+"后"+temp1);
}
</script>
</head>
<body onload="test()">
</body>
</html>
<script language="javascript">
var str="hAPPY,i'm a stdent,NOW";
var temp_str="";
for (var i=0;i<str.length;i++){
  var st=str.charAt(i);
  if(st==st.toUpperCase())
    temp_str =temp_str + st.toLowerCase();
  else
   temp_str += st.toUpperCase();
}
alert(temp_str);
</script>

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