JS案例：使用for...in语句遍历数组
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<meta charset="utf-8">
<title>数组使用示例</title>
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<script type="text/javascript">
var students,I;
students= new Array("张三","李四","王五","赵六");
for(i in students){
//下标从0开始遍历，一直到第4个元素
document.writeln("第"+(parseInt(i)+1)+"个同学是:"+students[i]);
}
</script>
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