加载框（loading）

一般在用户提交数据或者新加载页面时，请求服务器的过程，页面没有响应，但是用户并不知道，此时在发生什么。这时，就需要loading框给用户提示，增加用户体验。

1、引入loading.css。

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img{border:0}a{text-decoration:none;-webkit-tap-highlight-color:rgba(0,0,0,0)}@font-face{font-weight:400;font-style:normal;font-family:weui;src:url('data:application/octet-stream;base64,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format('truetype')}[class*=" weui-icon-"],[class^=weui-icon-]{display:inline-block;vertical-align:middle;font:normal normal normal 14px/1 weui;font-size:inherit;text-rendering:auto;-webkit-font-smoothing:antialiased}[class*=" weui-icon-"]:before,[class^=weui-icon-]:before{display:inline-block;margin-left:.2em;margin-right:.2em}.weui-icon-circle:before{content:"\EA01"}.weui-icon-download:before{content:"\EA02"}.weui-icon-info:before{content:"\EA03"}.weui-icon-safe-success:before{content:"\EA04"}.weui-icon-safe-warn:before{content:"\EA05"}.weui-icon-success:before{content:"\EA06"}.weui-icon-success-circle:before{content:"\EA07"}.weui-icon-success-no-circle:before{content:"\EA08"}.weui-icon-waiting:before{content:"\EA09"}.weui-icon-waiting-circle:before{content:"\EA0A"}.weui-icon-warn:before{content:"\EA0B"}.weui-icon-info-circle:before{content:"\EA0C"}.weui-icon-cancel:before{content:"\EA0D"}.weui-icon-search:before{content:"\EA0E"}.weui-icon-clear:before{content:"\EA0F"}.weui-icon-back:before{content:"\EA10"}.weui-icon-delete:before{content:"\EA11"}[class*=" weui-icon_"]:before,[class^=weui-icon_]:before{margin:0}.weui-icon-success{font-size:23px;color:#09bb07}.weui-icon-waiting{font-size:23px;color:#10aeff}.weui-icon-warn{font-size:23px;color:#f43530}.weui-icon-info{font-size:23px;color:#10aeff}.weui-icon-success-circle,.weui-icon-success-no-circle{font-size:23px;color:#09bb07}.weui-icon-waiting-circle{font-size:23px;color:#10aeff}.weui-icon-circle{font-size:23px;color:#c9c9c9}.weui-icon-download,.weui-icon-info-circle{font-size:23px;color:#09bb07}.weui-icon-safe-success{color:#09bb07}.weui-icon-safe-warn{color:#ffbe00}.weui-icon-cancel{color:#f43530;font-size:22px}.weui-icon-clear,.weui-icon-search{color:#b2b2b2;font-size:14px}.weui-icon-delete.weui-icon_gallery-delete{color:#fff;font-size:22px}.weui-icon_msg{font-size:93px}.weui-icon_msg.weui-icon-warn{color:#f76260}.weui-icon_msg-primary{font-size:93px}.weui-icon_msg-primary.weui-icon-warn{color:#ffbe00}.weui-btn{position:relative;display:block;margin-left:auto;margin-right:auto;padding-left:14px;padding-right:14px;box-sizing:border-box;font-size:18px;text-align:center;text-decoration:none;color:#fff;line-height:2.55555556;border-radius:5px;-webkit-tap-highlight-color:rgba(0,0,0,0);overflow:hidden}.weui-btn:after{content:" 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2em;color:#353535}.weui-skin_android .weui-dialog__ft{display:block;text-align:right;line-height:42px;font-size:16px;padding:0 1.6em .7em}.weui-skin_android .weui-dialog__ft:after{display:none}.weui-skin_android .weui-dialog__btn{display:inline-block;vertical-align:top;padding:0 .8em}.weui-skin_android .weui-dialog__btn:after{display:none}.weui-skin_android .weui-dialog__btn:active,.weui-skin_android .weui-dialog__btn:visited{background-color:rgba(0,0,0,.06)}.weui-skin_android .weui-dialog__btn:last-child{margin-right:-.8em}.weui-skin_android .weui-dialog__btn_default{color:gray}@media screen and (min-width:1024px){.weui-dialog{width:35%}}.weui-toast{position:fixed;z-index:5000;width:120px;min-height:120px;top:180px;left:50%;margin-left:-60px;background:hsla(0,0%,7%,.7);text-align:center;border-radius:5px;color:#fff}.weui-icon_toast{margin:22px 0 0;display:block}.weui-icon_toast.weui-icon-success-no-circle:before{color:#fff;font-size:55px}.weui-icon_toast.weui-loading{margin:30px 0 0;width:38px;height:38px;vertical-align:baseline}.weui-toast__content{margin:0 0 15px;font-size: 16px;}.weui-mask{background:rgba(0,0,0,.6)}.weui-mask,.weui-mask_transparent{position:fixed;z-index:1000;top:0;right:0;left:0;bottom:0}.weui-actionsheet{position:fixed;left:0;bottom:0;-webkit-transform:translateY(100%);transform:translateY(100%);-webkit-backface-visibility:hidden;backface-visibility:hidden;z-index:5000;width:100%;background-color:#efeff4;-webkit-transition:-webkit-transform .3s;transition:-webkit-transform .3s;transition:transform .3s;transition:transform .3s,-webkit-transform .3s}.weui-actionsheet__title{position:relative;height:65px;padding:0 20px;line-height:1.4;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;flex-direction:column;text-align:center;font-size:14px;color:#888;background:#fcfcfd}.weui-actionsheet__title:before{content:" ";position:absolute;left:0;bottom:0;right:0;height:1px;border-bottom:1px solid #e5e5e5;color:#e5e5e5;-webkit-transform-origin:0 100%;transform-origin:0 100%;-webkit-transform:scaleY(.5);transform:scaleY(.5)}.weui-actionsheet__title .weui-actionsheet__title-text{overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2}.weui-actionsheet__menu{background-color:#fcfcfd}.weui-actionsheet__action{margin-top:6px;background-color:#fcfcfd}.weui-actionsheet__cell{position:relative;padding:10px 0;text-align:center;font-size:18px}.weui-actionsheet__cell:before{content:" ";position:absolute;left:0;top:0;right:0;height:1px;border-top:1px solid #e5e5e5;color:#e5e5e5;-webkit-transform-origin:0 0;transform-origin:0 0;-webkit-transform:scaleY(.5);transform:scaleY(.5)}.weui-actionsheet__cell:active{background-color:#ececec}.weui-actionsheet__cell:first-child:before{display:none}.weui-skin_android .weui-actionsheet{position:fixed;left:50%;top:50%;bottom:auto;-webkit-transform:translate(-50%,-50%);transform:translate(-50%,-50%);width:274px;box-sizing:border-box;-webkit-backface-visibility:hidden;backface-visibility:hidden;background:transparent;-webkit-transition:-webkit-transform .3s;transition:-webkit-transform .3s;transition:transform .3s;transition:transform .3s,-webkit-transform .3s}.weui-skin_android .weui-actionsheet__action{display:none}.weui-skin_android .weui-actionsheet__menu{border-radius:2px;box-shadow:0 6px 30px 0 rgba(0,0,0,.1)}.weui-skin_android .weui-actionsheet__cell{padding:13px 24px;font-size:16px;line-height:1.4;text-align:left}.weui-skin_android .weui-actionsheet__cell:first-child{border-top-left-radius:2px;border-top-right-radius:2px}.weui-skin_android .weui-actionsheet__cell:last-child{border-bottom-left-radius:2px;border-bottom-right-radius:2px}.weui-actionsheet_toggle{-webkit-transform:translate(0);transform:translate(0)}.weui-loadmore{width:65%;margin:1.5em auto;line-height:1.6em;font-size:14px;text-align:center}.weui-loadmore__tips{display:inline-block;vertical-align:middle}.weui-loadmore_line{border-top:1px solid #e5e5e5;margin-top:2.4em}.weui-loadmore_line .weui-loadmore__tips{position:relative;top:-.9em;padding:0 .55em;background-color:#fff;color:#999}.weui-loadmore_dot .weui-loadmore__tips{padding:0 .16em}.weui-loadmore_dot .weui-loadmore__tips:before{content:" ";width:4px;height:4px;border-radius:50%;background-color:#e5e5e5;display:inline-block;position:relative;vertical-align:0;top:-.16em}.weui-badge{display:inline-block;padding:.15em .4em;min-width:8px;border-radius:18px;background-color:#f43530;color:#fff;line-height:1.2;text-align:center;font-size:12px;vertical-align:middle}.weui-badge_dot{padding:.4em;min-width:0}.weui-search-bar{position:relative;padding:8px 10px;display:-webkit-box;display:-webkit-flex;display:flex;box-sizing:border-box;background-color:#efeff4}.weui-search-bar:before{top:0;border-top:1px solid #d7d6dc;-webkit-transform-origin:0 0;transform-origin:0 0;-webkit-transform:scaleY(.5);transform:scaleY(.5)}.weui-search-bar:after,.weui-search-bar:before{content:" ";position:absolute;left:0;right:0;height:1px;color:#d7d6dc}.weui-search-bar:after{bottom:0;border-bottom:1px solid #d7d6dc;-webkit-transform-origin:0 100%;transform-origin:0 100%;-webkit-transform:scaleY(.5);transform:scaleY(.5)}.weui-search-bar.weui-search-bar_focusing .weui-search-bar__cancel-btn{display:block}.weui-search-bar.weui-search-bar_focusing .weui-search-bar__label{display:none}.weui-search-bar__form{position:relative;-webkit-box-flex:1;-webkit-flex:auto;flex:auto;background-color:#efeff4}.weui-search-bar__form:after{content:'';position:absolute;left:0;top:0;width:200%;height:200%;-webkit-transform:scale(.5);transform:scale(.5);-webkit-transform-origin:0 0;transform-origin:0 0;border-radius:10px;border:1px solid #e6e6ea;box-sizing:border-box;background:#fff}.weui-search-bar__box{position:relative;padding-left:30px;padding-right:30px;height:100%;width:100%;box-sizing:border-box;z-index:1}.weui-search-bar__box .weui-search-bar__input{padding:4px 0;width:100%;height:1.42857143em;border:0;font-size:14px;line-height:1.42857143em;box-sizing:content-box;background:transparent}.weui-search-bar__box .weui-search-bar__input:focus{outline:none}.weui-search-bar__box .weui-icon-search{position:absolute;left:10px;top:0;line-height:28px}.weui-search-bar__box .weui-icon-clear{position:absolute;top:0;right:0;padding:0 10px;line-height:28px}.weui-search-bar__label{position:absolute;top:1px;right:1px;bottom:1px;left:1px;z-index:2;border-radius:3px;text-align:center;color:#9b9b9b;background:#fff}.weui-search-bar__label span{display:inline-block;font-size:14px;vertical-align:middle}.weui-search-bar__label .weui-icon-search{margin-right:5px}.weui-search-bar__cancel-btn{display:none;margin-left:10px;line-height:28px;color:#09bb07;white-space:nowrap}.weui-search-bar__input:not(:valid)~.weui-icon-clear{display:none}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration,input[type=search]::-webkit-search-results-button,input[type=search]::-webkit-search-results-decoration{display:none}.weui-picker{position:fixed;width:100%;left:0;bottom:0;z-index:5000;-webkit-backface-visibility:hidden;backface-visibility:hidden;-webkit-transform:translateY(100%);transform:translateY(100%);-webkit-transition:-webkit-transform .3s;transition:-webkit-transform .3s;transition:transform .3s;transition:transform .3s,-webkit-transform .3s}.weui-picker__hd{display:-webkit-box;display:-webkit-flex;display:flex;padding:9px 15px;background-color:#fff;position:relative;text-align:center;font-size:17px}.weui-picker__hd:after{content:" ";position:absolute;left:0;bottom:0;right:0;height:1px;border-bottom:1px solid #e5e5e5;color:#e5e5e5;-webkit-transform-origin:0 100%;transform-origin:0 100%;-webkit-transform:scaleY(.5);transform:scaleY(.5)}.weui-picker__action{display:block;-webkit-box-flex:1;-webkit-flex:1;flex:1;color:#1aad19}.weui-picker__action:first-child{text-align:left;color:#888}.weui-picker__action:last-child{text-align:right}.weui-picker__bd{display:-webkit-box;display:-webkit-flex;display:flex;position:relative;background-color:#fff;height:238px;overflow:hidden}.weui-picker__group{-webkit-box-flex:1;-webkit-flex:1;flex:1;position:relative;height:100%}.weui-picker__mask{top:0;height:100%;margin:0 auto;background:-webkit-linear-gradient(top,hsla(0,0%,100%,.95),hsla(0,0%,100%,.6)),-webkit-linear-gradient(bottom,hsla(0,0%,100%,.95),hsla(0,0%,100%,.6));background:linear-gradient(180deg,hsla(0,0%,100%,.95),hsla(0,0%,100%,.6)),linear-gradient(0deg,hsla(0,0%,100%,.95),hsla(0,0%,100%,.6));background-position:top,bottom;background-size:100% 102px;background-repeat:no-repeat;-webkit-transform:translateZ(0);transform:translateZ(0)}.weui-picker__indicator,.weui-picker__mask{position:absolute;left:0;width:100%;z-index:3}.weui-picker__indicator{height:34px;top:102px}.weui-picker__indicator:before{top:0;border-top:1px solid #e5e5e5;-webkit-transform-origin:0 0;transform-origin:0 0;-webkit-transform:scaleY(.5);transform:scaleY(.5)}.weui-picker__indicator:after,.weui-picker__indicator:before{content:" ";position:absolute;left:0;right:0;height:1px;color:#e5e5e5}.weui-picker__indicator:after{bottom:0;border-bottom:1px solid #e5e5e5;-webkit-transform-origin:0 100%;transform-origin:0 100%;-webkit-transform:scaleY(.5);transform:scaleY(.5)}.weui-picker__content{position:absolute;top:0;left:0;width:100%}.weui-picker__item{padding:0;height:34px;line-height:34px;text-align:center;color:#000;text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.weui-picker__item_disabled{color:#999}@-webkit-keyframes a{0%{-webkit-transform:translate3d(0,100%,0);transform:translate3d(0,100%,0)}to{-webkit-transform:translateZ(0);transform:translateZ(0)}}@keyframes a{0%{-webkit-transform:translate3d(0,100%,0);transform:translate3d(0,100%,0)}to{-webkit-transform:translateZ(0);transform:translateZ(0)}}.weui-animate-slide-up{-webkit-animation:a ease .3s forwards;animation:a ease .3s forwards}@-webkit-keyframes b{0%{-webkit-transform:translateZ(0);transform:translateZ(0)}to{-webkit-transform:translate3d(0,100%,0);transform:translate3d(0,100%,0)}}@keyframes b{0%{-webkit-transform:translateZ(0);transform:translateZ(0)}to{-webkit-transform:translate3d(0,100%,0);transform:translate3d(0,100%,0)}}.weui-animate-slide-down{-webkit-animation:b ease .3s forwards;animation:b ease .3s forwards}@-webkit-keyframes c{0%{opacity:0}to{opacity:1}}@keyframes c{0%{opacity:0}to{opacity:1}}.weui-animate-fade-in{-webkit-animation:c ease .3s forwards;animation:c ease .3s forwards}@-webkit-keyframes d{0%{opacity:1}to{opacity:0}}@keyframes d{0%{opacity:1}to{opacity:0}}.weui-animate-fade-out{-webkit-animation:d ease .3s forwards;animation:d ease .3s forwards}.weui-agree{display:block;padding:.5em 15px;font-size:13px}.weui-agree a{color:#586c94}.weui-agree__text{color:#999}.weui-agree__checkbox{-webkit-appearance:none;appearance:none;outline:0;font-size:0;border:1px solid #d1d1d1;background-color:#fff;border-radius:3px;width:13px;height:13px;position:relative;vertical-align:0;top:2px}.weui-agree__checkbox:checked:before{font-family:weui;font-style:normal;font-weight:400;font-variant:normal;text-transform:none;text-align:center;speak:none;display:inline-block;vertical-align:middle;text-decoration:inherit;content:"\EA08";color:#09bb07;font-size:13px;position:absolute;top:50%;left:50%;-webkit-transform:translate(-50%,-48%) scale(.73);transform:translate(-50%,-48%) scale(.73)}.weui-agree__checkbox:disabled{background-color:#e1e1e1}.weui-agree__checkbox:disabled:before{color:#adadad}.weui-loading{width:20px;height:20px;display:inline-block;vertical-align:middle;-webkit-animation:e 1s steps(12) infinite;animation:e 1s steps(12) infinite;background:transparent url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMjAiIGhlaWdodD0iMTIwIiB2aWV3Qm94PSIwIDAgMTAwIDEwMCI+PHBhdGggZmlsbD0ibm9uZSIgZD0iTTAgMGgxMDB2MTAwSDB6Ii8+PHJlY3Qgd2lkdGg9IjciIGhlaWdodD0iMjAiIHg9IjQ2LjUiIHk9IjQwIiBmaWxsPSIjRTlFOUU5IiByeD0iNSIgcnk9IjUiIHRyYW5zZm9ybT0idHJhbnNsYXRlKDAgLTMwKSIvPjxyZWN0IHdpZHRoPSI3IiBoZWlnaHQ9IjIwIiB4PSI0Ni41IiB5PSI0MCIgZmlsbD0iIzk4OTY5NyIgcng9IjUiIHJ5PSI1IiB0cmFuc2Zvcm09InJvdGF0ZSgzMCAxMDUuOTggNjUpIi8+PHJlY3Qgd2lkdGg9IjciIGhlaWdodD0iMjAiIHg9IjQ2LjUiIHk9IjQwIiBmaWxsPSIjOUI5OTlBIiByeD0iNSIgcnk9IjUiIHRyYW5zZm9ybT0icm90YXRlKDYwIDc1Ljk4IDY1KSIvPjxyZWN0IHdpZHRoPSI3IiBoZWlnaHQ9IjIwIiB4PSI0Ni41IiB5PSI0MCIgZmlsbD0iI0EzQTFBMiIgcng9IjUiIHJ5PSI1IiB0cmFuc2Zvcm09InJvdGF0ZSg5MCA2NSA2NSkiLz48cmVjdCB3aWR0aD0iNyIgaGVpZ2h0PSIyMCIgeD0iNDYuNSIgeT0iNDAiIGZpbGw9IiNBQkE5QUEiIHJ4PSI1IiByeT0iNSIgdHJhbnNmb3JtPSJyb3RhdGUoMTIwIDU4LjY2IDY1KSIvPjxyZWN0IHdpZHRoPSI3IiBoZWlnaHQ9IjIwIiB4PSI0Ni41IiB5PSI0MCIgZmlsbD0iI0IyQjJCMiIgcng9IjUiIHJ5PSI1IiB0cmFuc2Zvcm09InJvdGF0ZSgxNTAgNTQuMDIgNjUpIi8+PHJlY3Qgd2lkdGg9IjciIGhlaWdodD0iMjAiIHg9IjQ2LjUiIHk9IjQwIiBmaWxsPSIjQkFCOEI5IiByeD0iNSIgcnk9IjUiIHRyYW5zZm9ybT0icm90YXRlKDE4MCA1MCA2NSkiLz48cmVjdCB3aWR0aD0iNyIgaGVpZ2h0PSIyMCIgeD0iNDYuNSIgeT0iNDAiIGZpbGw9IiNDMkMwQzEiIHJ4PSI1IiByeT0iNSIgdHJhbnNmb3JtPSJyb3RhdGUoLTE1MCA0NS45OCA2NSkiLz48cmVjdCB3aWR0aD0iNyIgaGVpZ2h0PSIyMCIgeD0iNDYuNSIgeT0iNDAiIGZpbGw9IiNDQkNCQ0IiIHJ4PSI1IiByeT0iNSIgdHJhbnNmb3JtPSJyb3RhdGUoLTEyMCA0MS4zNCA2NSkiLz48cmVjdCB3aWR0aD0iNyIgaGVpZ2h0PSIyMCIgeD0iNDYuNSIgeT0iNDAiIGZpbGw9IiNEMkQyRDIiIHJ4PSI1IiByeT0iNSIgdHJhbnNmb3JtPSJyb3RhdGUoLTkwIDM1IDY1KSIvPjxyZWN0IHdpZHRoPSI3IiBoZWlnaHQ9IjIwIiB4PSI0Ni41IiB5PSI0MCIgZmlsbD0iI0RBREFEQSIgcng9IjUiIHJ5PSI1IiB0cmFuc2Zvcm09InJvdGF0ZSgtNjAgMjQuMDIgNjUpIi8+PHJlY3Qgd2lkdGg9IjciIGhlaWdodD0iMjAiIHg9IjQ2LjUiIHk9IjQwIiBmaWxsPSIjRTJFMkUyIiByeD0iNSIgcnk9IjUiIHRyYW5zZm9ybT0icm90YXRlKC0zMCAtNS45OCA2NSkiLz48L3N2Zz4=) no-repeat;background-size:100%}.weui-btn_loading.weui-btn_primary .weui-loading,.weui-btn_loading.weui-btn_warn .weui-loading,.weui-loading.weui-loading_transparent{background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 100 100'%3E%3Cpath fill='none' d='M0 0h100v100H0z'/%3E%3Crect xmlns='http://www.w3.org/2000/svg' width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.56)' rx='5' ry='5' transform='translate(0 -30)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.5)' rx='5' ry='5' transform='rotate(30 105.98 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.43)' rx='5' ry='5' transform='rotate(60 75.98 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.38)' rx='5' ry='5' transform='rotate(90 65 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.32)' rx='5' ry='5' transform='rotate(120 58.66 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.28)' rx='5' ry='5' transform='rotate(150 54.02 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.25)' rx='5' ry='5' transform='rotate(180 50 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.2)' rx='5' ry='5' transform='rotate(-150 45.98 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.17)' rx='5' ry='5' transform='rotate(-120 41.34 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.14)' rx='5' ry='5' transform='rotate(-90 35 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.1)' rx='5' ry='5' transform='rotate(-60 24.02 65)'/%3E%3Crect width='7' height='20' x='46.5' y='40' fill='rgba(255,255,255,.03)' rx='5' ry='5' transform='rotate(-30 -5.98 65)'/%3E%3C/svg%3E")}@-webkit-keyframes e{0%{-webkit-transform:rotate(0deg);transform:rotate(0deg)}to{-webkit-transform:rotate(1turn);transform:rotate(1turn)}}@keyframes e{0%{-webkit-transform:rotate(0deg);transform:rotate(0deg)}to{-webkit-transform:rotate(1turn);transform:rotate(1turn)}}.weui-slider{padding:15px 18px;-webkit-user-select:none;user-select:none}.weui-slider__inner{position:relative;height:2px;background-color:#e9e9e9}.weui-slider__track{height:2px;background-color:#1aad19;width:0}.weui-slider__handler{position:absolute;left:0;top:50%;width:28px;height:28px;margin-left:-14px;margin-top:-14px;border-radius:50%;background-color:#fff;box-shadow:0 0 4px rgba(0,0,0,.2)}.weui-slider-box{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center}.weui-slider-box .weui-slider{-webkit-box-flex:1;-webkit-flex:1;flex:1}.weui-slider-box__value{margin-left:.5em;min-width:24px;color:#888;text-align:center;font-size:14px}

2、引入loading.js。

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    if(null!==p.temp&&p.temp<p.items.length){var x=p.temp;p.onChange.call(this,p.items[x],x),_=(p.offset-x)*p.rowHeight}else{var C=s(p.items);p.onChange.call(this,p.items[C],C),_=d(p.offset,p.rowHeight,p.items)}l(m,_);var M=function(e){_+=e,_=Math.round(_/p.rowHeight)*p.rowHeight;var t=f(p.offset,p.rowHeight),n=c(p.offset,p.rowHeight,p.items.length);_>t&&(_=t),_<n&&(_=n);for(var i=p.offset-_/p.rowHeight;p.items[i]&&p.items[i].disabled;)e>0?++i:--i;_=(p.offset-i)*p.rowHeight,u(m,.3),l(m,_),p.onChange.call(a,p.items[i],i)};m=v.offAll().on("touchstart",function(e){t(e.changedTouches[0].pageY)}).on("touchmove",function(e){n(e.changedTouches[0].pageY),e.preventDefault()}).on("touchend",function(e){i(e.changedTouches[0].pageY)}).find(p.scrollable);var j="ontouchstart"in window||window.DocumentTouch&&document instanceof window.DocumentTouch;j||v.on("mousedown",function(e){t(e.pageY),e.stopPropagation(),e.preventDefault()}).on("mousemove",function(e){y&&(n(e.pageY),e.stopPropagation(),e.preventDefault())}).on("mouseup mouseleave",function(e){i(e.pageY),e.stopPropagation(),e.preventDefault()})}},function(e,t){"use strict";Object.defineProperty(t,"__esModule",{value:!0});t.depthOf=function e(t){var n=1;return t.children&&t.children[0]&&(n=e(t.children[0])+1),n}},function(e,t){e.exports='<div class="<%= className %>"> <div class=weui-mask></div> <div class=weui-picker> <div class=weui-picker__hd> <a href=javascript:; data-action=cancel class=weui-picker__action>取消</a> <a href=javascript:; data-action=select class=weui-picker__action id=weui-picker-confirm>确定</a> </div> <div class=weui-picker__bd></div> </div> </div> '},function(e,t){e.exports="<div class=weui-picker__group> <div class=weui-picker__mask></div> <div class=weui-picker__indicator></div> <div class=weui-picker__content></div> </div>"},function(e,t,n){"use strict";function i(e){return e&&e.__esModule?e:{default:e}}function o(e){function t(e){t=r.default.noop,o.addClass("weui-animate-fade-out").on("animationend webkitAnimationEnd",function(){o.remove(),s=!1,e&&e()})}function n(e){t(e)}var i=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};if(s)return s;i=r.default.extend({className:"",onDelete:r.default.noop},i);var o=(0,r.default)(r.default.render(l.default,r.default.extend({url:e},i)));return(0,r.default)("body").append(o),o.find(".weui-gallery__img").on("click",function(){n()}),o.find(".weui-gallery__del").on("click",function(){i.onDelete.call(this,e)}),o.show().addClass("weui-animate-fade-in"),s=o[0],s.hide=n,s}Object.defineProperty(t,"__esModule",{value:!0});var a=n(2),r=i(a),u=n(31),l=i(u),s=void 0;t.default=o,e.exports=t.default},function(e,t){e.exports='<div class="weui-gallery <%= className %>"> <span class=weui-gallery__img style="background-image:url(<%= url %>)"></span> <div class=weui-gallery__opr> <a href=javascript: class=weui-gallery__del> <i class="weui-icon-delete weui-icon_gallery-delete"></i> </a> </div> </div> '},function(e,t,n){"use strict";function i(e){return e&&e.__esModule?e:{default:e}}function o(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n=(0,r.default)(e);if(t=r.default.extend({step:void 0,defaultValue:0,onChange:r.default.noop},t),void 0!==t.step&&(t.step=parseFloat(t.step),!t.step||t.step<0))throw new Error("Slider step must be a positive number.");if(void 0!==t.defaultValue&&t.defaultValue<0||t.defaultValue>100)throw new Error("Slider defaultValue must be >= 0 and <= 100.");return n.forEach(function(e){function n(){var e=r.default.getStyle(l[0],"left");return e=/%/.test(e)?s*parseFloat(e)/100:parseFloat(e)}function i(n){var i=void 0,o=void 0;t.step&&(n=Math.round(n/p)*p),i=f+n,i=i<0?0:i>s?s:i,o=100*i/s,u.css({width:o+"%"}),l.css({left:o+"%"}),t.onChange.call(e,o)}var o=(0,r.default)(e),a=o.find(".weui-slider__inner"),u=o.find(".weui-slider__track"),l=o.find(".weui-slider__handler"),s=parseInt(r.default.getStyle(a[0],"width")),d=a[0].offsetLeft,f=0,c=0,p=void 0;t.step&&(p=s*t.step/100),t.defaultValue&&i(s*t.defaultValue/100),o.on("click",function(e){e.preventDefault(),f=n(),i(e.pageX-d-f)}),l.on("touchstart",function(e){f=n(),c=e.changedTouches[0].clientX}).on("touchmove",function(e){e.preventDefault(),i(e.changedTouches[0].clientX-c)})}),this}Object.defineProperty(t,"__esModule",{value:!0});var a=n(2),r=i(a);t.default=o,e.exports=t.default}])});

 3、在需要出现加载框的地方添加以下代码。

 var loading = weui.loading('正在加载');

4、在需要关闭加载框的地方添加以下代码。

loading.hide();