百度收录一会是带www域名，一会是不带www的域名，是什么原因？
<section style="box-sizing: border-box; text-align: justify;"><section style="padding-right: 20px; margin-top: 10px; margin-bottom: 10px; position: static; box-sizing: border-box;" powered-by="xiumi.us"><section style="display: inline-block; padding: 10px; vertical-align: top; width: 100%; border: 1px solid rgb(95, 156, 239); box-shadow: rgb(204, 204, 204) 3px 3px 5px; background-color: rgb(255, 255, 255); margin-right: -20px; box-sizing: border-box;"><section style="font-size: 19px; box-sizing: border-box;" powered-by="xiumi.us"><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; box-sizing: border-box;"><span style="font-size: 16px;">为什么我的新站前天收录了首页，现在又没带WWW的了。我只是把关键词密度增加了一点。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; box-sizing: border-box;"></p></section></section><section style="display: inline-block; vertical-align: top; width: 0px; margin: 2em 0px 0px 19px; box-sizing: border-box;"><section style="width: 0px; border-left: 20px solid rgb(95, 156, 239); border-top: 10px solid transparent !important; border-bottom: 10px solid transparent !important; box-sizing: border-box;"><section><svg viewBox="0 0 1 1" style="float:left;line-height:0;width:0;vertical-align:top;"></svg></section></section><section style="width: 0px; margin: -19px 0px; border-left: 18px solid rgb(255, 255, 255); border-top: 9px solid transparent !important; border-bottom: 9px solid transparent !important; box-sizing: border-box;"><section><svg viewBox="0 0 1 1" style="float:left;line-height:0;width:0;vertical-align:top;"></svg></section></section></section></section><section style="padding-left: 19px; margin-top: 10px; margin-bottom: 10px; position: static; box-sizing: border-box;" powered-by="xiumi.us"><section style="width: 0px; margin: 2em 22px 0px -19px; display: inline-block; vertical-align: top; box-sizing: border-box;"><section style="width: 0px; border-right: 20px solid rgb(95, 156, 239); border-top: 10px solid transparent !important; border-bottom: 10px solid transparent !important; box-sizing: border-box;"><section><svg viewBox="0 0 1 1" style="float:left;line-height:0;width:0;vertical-align:top;"></svg></section></section><section style="width: 0px; margin: -19px 0px -19px 3px; border-right: 18px solid rgb(255, 255, 255); border-top: 9px solid transparent !important; border-bottom: 9px solid transparent !important; box-sizing: border-box;"><section><svg viewBox="0 0 1 1" style="float:left;line-height:0;width:0;vertical-align:top;"></svg></section></section></section><section style="padding: 10px; width: 100%; margin-top: -2em; min-height: 4em; border: 1px solid rgb(95, 156, 239); box-shadow: rgb(204, 204, 204) -3px 3px 5px; background-color: rgb(255, 255, 255); box-sizing: border-box;"><section style="font-size: 19px; box-sizing: border-box;" powered-by="xiumi.us"><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; box-sizing: border-box;"><span style="font-size: 16px;">通过实际搜索结果和访问你网站，发现你没有设置首选域。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; box-sizing: border-box;"><span style="font-size: 16px;">即不带www的域名没有做301跳转到带www域名，所以现在就会出现两个域名；</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; box-sizing: border-box;"><span style="font-size: 16px;">被百度选一个为首选域的情况，两个域名可能会交替。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; box-sizing: border-box;"><span style="font-size: 16px;"><br></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; box-sizing: border-box;"><span style="font-size: 16px;">现在需要给做下301跳转，确认好首选域。</span><span style="font-size: 16px;">一段时间后，百度就会以首选域为主收录。</span></p></section></section></section></section><p><br></p>
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