javascript对文本进行关键字过滤

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<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>对文本内容进行关键词过滤</title></head><body><textarea cols="100" rows="6" id="filter"></textarea><script>    window.onload=function(){        var    filter=document.getElementById("filter"),                keywords=["javascript","美女",/[外]{1}.{0,3}[挂]{1}/],                keywordslen=keywords.length;        filter.onkeyup=function(){            for(var i=0;i<keywordslen;i++){                filter.value=filter.value.replace(keywords[i],"*");            }        }    }</script></body></html>

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