网页代码咨询

在一个网站上看到这样一段代码：

<script>document.write(unescape('%3Cscript%3Edocument.write%28unescape%28%27%253Cscript%253Edocument.write%2528unescape%2528%2527%25253CSCRIPT%252520language%25253DJAVASCRIPT%25253E%252520%252520%252520%25250D%25250A%25253C%252521--%252520%252520%252520%25250D%25250Aloopy%252528%252529%252520%252520%252520%25250D%25250Afunction%252520loopy%252528%252529%252520%25257B%252520%252520%252520%25250D%25250Avar%252520sWord%252520%25253D%252522%252522%252520%252520%252520%25250D%25250Awhile%252520%252528sWord%252520%252521%25253D%252520%2525224321%252522%252529%252520%25257B%252520//%252520%252520%25250D%25250AsWord%252520%25253D%252520prompt%252528%252522%2525u8F93%2525u5165%2525u6B63%2525u786E%2525u5BC6%2525u7801%2525u624D%2525u80FD%2525u767B%2525u9646%252521%252522%252529%252520//%252520%2525u6027%2525u7231%2525u767E%2525u62DB%25250D%25250A%25257D%252520%252520%252520%25250D%25250Aalert%252528%252522%2525u53EF%2525u4EE5%2525u770B%2525u4E86%252522%252529%

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