推荐回答（3个）
1、创建一个html文件；
2、在html文件找到一个
标签，在这个标签里创建一个
标签并添加一个类，在这把这个类设置为：rgba；
3、为div添加样式。在
标签后面创建一个<style>，在<style>标签里设置rgba类的高和背景透明度的样式（rgba(R,G,B,A)）。透明度参数，取值在0~1之间，不可为负值，透明度参数越小透明度越高；</p>
<p><img loading="lazy" class="ikqb_img" src="/picurl?url=https%3A%2F%2Fiknow-pic.cdn.bcebos.com%2Fc83d70cf3bc79f3db1cabcddb1a1cd11728b2937%3Fx-bce-process%3Dimage%252Fresize%252Cm_lfit%252Cw_600%252Ch_800%252Climit_1%252Fquality%252Cq_85%252Fformat%252Cf_auto" esrc="https://iknow-pic.cdn.bcebos.com/c83d70cf3bc79f3db1cabcddb1a1cd11728b2937"></p>
<p>4、保存后使用浏览器查看。可以看到当透明度为由0.1修改为1时div背景由灰色变为了黑色；</p>
<p><img loading="lazy" class="ikqb_img" src="/picurl?url=https%3A%2F%2Fiknow-pic.cdn.bcebos.com%2F3ac79f3df8dcd100f108a0cc798b4710b8122f42%3Fx-bce-process%3Dimage%252Fresize%252Cm_lfit%252Cw_600%252Ch_800%252Climit_1%252Fquality%252Cq_85%252Fformat%252Cf_auto" esrc="https://iknow-pic.cdn.bcebos.com/3ac79f3df8dcd100f108a0cc798b4710b8122f42"></p>
<p><img loading="lazy" class="ikqb_img" src="/picurl?url=https%3A%2F%2Fiknow-pic.cdn.bcebos.com%2Fc995d143ad4bd113063cefdf51afa40f4afb056d%3Fx-bce-process%3Dimage%252Fresize%252Cm_lfit%252Cw_600%252Ch_800%252Climit_1%252Fquality%252Cq_85%252Fformat%252Cf_auto" esrc="https://iknow-pic.cdn.bcebos.com/c995d143ad4bd113063cefdf51afa40f4afb056d"></p>
<p><img loading="lazy" class="ikqb_img" src="/picurl?url=https%3A%2F%2Fiknow-pic.cdn.bcebos.com%2Fc8ea15ce36d3d5395708542e3187e950352ab022%3Fx-bce-process%3Dimage%252Fresize%252Cm_lfit%252Cw_600%252Ch_800%252Climit_1%252Fquality%252Cq_85%252Fformat%252Cf_auto" esrc="https://iknow-pic.cdn.bcebos.com/c8ea15ce36d3d5395708542e3187e950352ab022"></p>
<p>5、所有代码。可以把所有代码复制到新建的html文件上，保存好后使用浏览器打开借口看到效果。</p>
<p><img loading="lazy" class="ikqb_img" src="/picurl?url=https%3A%2F%2Fiknow-pic.cdn.bcebos.com%2Faa18972bd40735fa8fc2155495510fb30f240828%3Fx-bce-process%3Dimage%252Fresize%252Cm_lfit%252Cw_600%252Ch_800%252Climit_1%252Fquality%252Cq_85%252Fformat%252Cf_auto" esrc="https://iknow-pic.cdn.bcebos.com/aa18972bd40735fa8fc2155495510fb30f240828"></p>
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<div class="wdhuidaxm">回答2：</div>
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<p>设置透明度要用css样式了：<br>透明度的话ie下用filter:alpha(opacity=50);范围0到100，非ie下用opacity:0.5,范围0到1</p>
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<div class="wdhuidaxm">回答3：</div>
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<p>设置CSS样式<br>opacity: 0.45</p>
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