29js基础，循环
<head>
<meta charset="UTF-8">
<title>8循环结构</title>
</head>
<body>
<script>
//1,while循环
//2,do-while循环
//1,for循环
for (var i = 0; i <100 ; i++) {
document.writeln(i+1+"<br>")
}
</script>
</body>
<head>
<meta charset="UTF-8">
<title>8循环结构</title>
</head>
<body>
<script>
//1,while循环
//2,do-while循环
//1,for循环
for (var i = 0; i <100 ; i++) {
document.writeln(i+1+"<br>")
}
</script>
</body>
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