close
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
var i = 0;
do{
document.write('很重要所以要跑三次,已經跑了'+(i+1)+'次<br>');
i++;
}while(i<3);
if(i>=3){
document.write('三次結束囉');
}
</script>
</body>
</html>
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