<script>
function MM_over(mmObj) {
var mSubObj = mmObj.getElementsByTagName("p")[0];
mSubObj.style.display = "none";
}
function MM_out(mmObj) {
var mSubObj = mmObj.getElementsByTagName("p")[0];
mSubObj.style.display = "block";
}
</script>
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因为你函数没执行
要么就是没有获取到元素,要么就是调用错误