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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>作业</title>
</head>
<script type="text/javascript">
var str='Abcdefg Abcdefg Abcdefg Abcdefg Abcdefg';
var a=str.split("");
document.write(a)
var count=0;
for(var i=0;i<str.length;i++)
{
var b=arr[i].indexOf("def");
if(b>=0)
count++;
}
document.write('满足');
</script>
<body>
</body>
</html>