具体代码如下：
confirm和alert的demo /*w-error-popup-white*/.w-error-popup-white{ width: 100%; height: 100%; z-index: 999; position: fixed; left: 0; top:0;}.w-error-popup-white .w-error-back{ width: 100%; height: 100%; background-color: rgba(0,0,0,.8); position:fixed; z-index: 1000; left: 0; top:0;}.w-error-popup-white .w-error-inner{ background-color: #fff; width: 90%; top: 15%; left: 50%; margin-left: -45%; text-align: center; border-radius: 20px; padding: 0; z-index: 1001; position: relative;}.w-error-popup-white .w-error-inner h4{ font-size: 20px; color: #333; padding: 16px 0; margin: 0 32px; border-bottom: 1px solid #e5e9ec; font-weight: normal; }.w-error-popup-white .w-error-inner .w-error-content{ color: #333; font-size: 16px; line-height: 45px; padding: 32px; height: 270px; overflow-y:auto; overflow-x:hidden; text-align: left; }.w-close{ background: url(images/result-error-x.png) no-repeat right 16px; float: right; right:18px; top:0; position:absolute; z-index: 999; width: 100px; height:85px; cursor:pointer; display: block; background-size:60%;}/*u-btn */.u-btn{ padding: 16px 80px; background-color: #92c153; border-bottom: 5px solid #7da646; border-radius: 8px; color: #fff; display: inline-block; vertical-align: middle;}.u-btn-red{ background-color: #ec7d69; border-color: #e95c44;}
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