实现首字母大写，其他字母小写
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
</body>
<script type="text/javascript">
function titleCase(str) {
var array = str.toLowerCase().split(" ");
for(var i = 0; i < array.length; i++) {
array[i] = array[i][0].toUpperCase() + array[i].substring(1, array[i].length);
//array[i][0] = array[i][0] + 'A' - 'a';
}
var string = array.join(" ");
return string;
}
var i = titleCase("I'm a little tea pot");
alert(i)
</script>
</html>
