最近呢，老大让做一个进度条的效果出来，这个之前还真没做过。刚好这周没什么东西了，就拿这个来充一下数吧。

文件上传，得先准备一个“按钮”：

这个看上去还是不错的吧，实现也是很简单的：

<span class="upload-span">开始上传文件</span>

<button>太丑了，就用span来做了，可控性强。添加点css:

.upload-span{
    display: inline-block;
    width: 120px;
    height: 40px;
    color: #FFFFFF;
    text-align: center;
    line-height: 40px;
    background-color: blue;
    border: 2px solid blue;
    border-radius:5px;
    cursor: pointer;
    letter-spacing: 2px;
}

当点击就会触发上传效果，之后添加事件。
逼真一点，得再加一个遮罩和一个显示进度条的控件，点击span后，效果大概是这样子的：

  <div class="upload-mask"></div>
    <div class="upload-component">
        <div class="upload-close">
            <span class="upload-close-span">关闭</span>
        </div>
        <div class="upload-content">
            <div class="progress">
                <span class="upload-text"></span>
                <span class="uploaded"></span>
            </div>
            <div class="confirm-cancel">
                <span class="confirm">确认</span>
                <span class="cancel">取消</span>
            </div>
        </div>
   </div>

加点css上去：

.upload-mask{
    position: absolute;
    top: 0;
    left: 0;
    z-index: 9;
    width: 100%;
    height: 100%;
    background-color: rgba(84,84,84,0.3);
    display: none;
}
.upload-component{
    position: absolute;
    z-index: 99;
    top: 50%;
    left: 50%;
    margin-left: -120px;
    margin-top: -60px;
    width: 240px;
    height: 120px;
    background-color: #FFFFFF;
    display:none;
}
.upload-close{
    position: relative;
    height: 30px;
    background-color: rgb(234,234,234);
}
.upload-close span{
    position: absolute;
    right: 15px;
    line-height: 30px;
    cursor: pointer;
}
.upload-content,.confirm-cancel{
    margin-top: 15px;
}
.progress{
    position:relative;
    width:90%;
    height:22px;
    margin-left: 4.88888%;
    text-align: center;
    line-height: 22px;
    /*background-color: blue;*/
    border:1px solid #ccc;
}
.upload-text{
    position:absolute;
    z-index: 99999;
    color:red;
}
.uploaded{
    position:absolute;
    left:0;
    z-index: 9999;
    width:0%;
    height:100%;
    background-color: blue;
    color:#FFFFFF;
}
.confirm-cancel span{
    display:inline-block;
    width:60px;
    height:30px;
    line-height: 30px;
    text-align: center;
    /*cursor:pointer;*/
    background-color:#ccc;
    cursor:wait;
}
.confirm{
    /*background-color: rgb(111,197,293);*/
    margin-left:40%;
}
.cancel{
    /*background-color: rgb(175,194,211);*/
    margin-left: 10px;
}

为了模拟进度的显示，在这里用了两个span：

<div class="progress">
    <span class="upload-text"></span>
    <span class="uploaded"></span>
</div>

上面一个是用来显示百分比的，下面一个用来填色的：

.upload-text{
    position:absolute;
    z-index: 99999;
    color:red;
}
.uploaded{
    position:absolute;
    left:0;
    z-index: 9999;
    width:0%;
    height:100%;
    background-color: blue;
    color:#FFFFFF;
}

为了逼真，给填色的span设置背景色，其宽度就是进度的百分比，最后就用js来模拟进度的变化了：

    // 模拟进度
    function progressBar() {
        var max = 100;
        var init = 0;
        var uploaded;
        var test = setInterval(function() {
            init += 10;
            uploaded = parseInt((init / max * 100)) + '%';
            $uploadTextSpan.text(uploaded).next().css({
				width:uploaded
			});
			if (init === 100) {
				clearInterval(test);
				$uploadTextSpan.text('上传完成');
				$('.confirm-cancel span').css({
					cursor:'pointer'
				});
				$('.confirm').css({
					backgroundColor:'rgb(111,197,293)'
				});
				$('.cancel').css({
					backgroundColor:'rgb(175,194,211)'
				})
				$closeConfirmCancel.on('click',closeConfirmCancel);
			} 
			else {  
				$closeConfirmCancel.off('click',closeConfirmCancel);
				$('.upload-close-span').on('click',function(){
					clearInterval(test);
					closeConfirmCancel();
				});
				$uploadMask.on('click',function() {
                    clearInterval(test);
                    closeConfirmCancel();
                })
            }
        },1000);
    }

其它次要代码就不贴了，最终效果可以戳：http://test92.sinaapp.com/upload/upload.html

css下载：http://test92.sinaapp.com/upload/upload.css
js下载：http://test92.sinaapp.com/upload/upload.js