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);
}