在进行图片上传的时候，因为有些图片太大，为了减轻服务器的压力，我们需要将图片进行压缩上传。今天总结一下利用localResizeIMG如何将图片压缩转为base64上传，其中localResizeIMG插件已上传csdn。
代码如下：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<title>证件上传</title>
<link rel="stylesheet" type="text/css" href="http://static.wanlianjin.com/data/m/wlcs/css/abb/common.css" />
<script src="http://static.wanlianjin.com/data/m/wlcs/js/nocar/jquery-1.7.2.min.js" type="text/javascript" charset="utf-8"></script>
<script src="http://static.wanlianjin.com/data/m/wlcs/js/nocar/rem.js" type="text/javascript" charset="utf-8"></script>
<script src="http://static.wanlianjin.com/data/m/wlcs/js/car/fnBase.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript" src="js/binaryajax.js" ></script>
<script type="text/javascript" src="js/exif.js" ></script>
<script type="text/javascript" src='js/LocalResizeIMG1.js'></script>
<script src='http://static.wanlianjin.com/data/m/wlcs/js/car/mobileBUGFix.mini.js' type="text/javascript" charset="utf-8" ></script>
<style>
* {
box-sizing: border-box;
}
body,
html {
height: 100%;
}
.content li{
width:6.04rem;
height:3.22rem;
margin:0.18rem auto 0;
position:relative;
}
.content li .tishi{
width:6.04rem;
height:3.22rem;
position:absolute;
top:0;
left:0;
display:none;
}
.active{
display:block !important;
z-index:9999;
}
.content li img{
position:absolute;
width:100%;
height:100%;
top:0;
}
.content li input{
width:1.2rem;
height:1.3rem;
position:absolute;
top:0.74rem;
left:2.47rem;
opacity:0;
}
</style>
</head>
<body>
<ul class="content">
<li id="DP">
<div class="tishi tishi1" onclick="upload('.DP','#_dp','.tishi1','x','xszj')"></div>
<img id="_dp" src="../image/paper/upload1.png"/>
<input class="DP" data-role="none" type="file" accept="image/*"/>
</li>
<li id="DL">
<div class="tishi tishi2" onclick="upload('.DL','#_dl','.tishi2','j','jszj')"></div>
<img id="_dl" src="../image/paper/upload2.jpg"/>
<input class="DL" data-role="none" type="file" accept="image/*"/>
</li>
<li id="ID">
<div class="tishi tishi3" onclick="upload('.ID','#_id','.tishi3','s','sfzj')"></div>
<img id="_id" src="../image/paper/upload3.png"/>
<input class="ID" data-role="none" type="file" accept="image/*"/>
</li>
</ul>
</body>
<script type="text/javascript">
var n = 0;
sessionStorage.xszj='';
sessionStorage.jszj='';
sessionStorage.sfzj='';
sessionStorage.setItem("imgpath","");
sessionStorage.b64data="";
//安卓调用本方法，获取参数,进行回显
function showPic(str){
var strType = str.slice(0,1);
var strSrc = str.slice(1);
if(strType == 'x') {
$('#_dp').attr('src',strSrc);
$('.tishi1').addClass('active');
}else if(strType == 'j'){
$('#_dl').attr('src',strSrc);
$('.tishi2').addClass('active');
}else{
$('#_id').attr('src',strSrc);
$('.tishi3').addClass('active');
}
}
//ios页面回显
compress('.DP',0.8,'#_dp','.tishi1');
compress('.DL',0.8,'#_dl','.tishi2');
compress('.ID',0.5,'#_id','.tishi3');
function upload(inputCla,imgId,ts,type,card){
n+=1;
var baseStr = $(imgId).attr('src').split(',')[1];
console.log(baseStr)
var name = 'avator'+n+'.jpg';
doUploadByBase64(name,baseStr,ts,type,card);
}
//compress压缩转换成base64位上传
//参数解释:inputCla:上传input的class;qua:压缩图片的质量（取值为0-1）越大越好;imgId:回显图片的id
function compress(inputCla,qua,imgId,ts){
$(inputCla).localResizeIMG({
//width:400 宽度
quality: qua,
success: function (result) {
var img = new Image();
img.src = result.base64;
/**
result.base64:带图片类型的base64编码，可直接用于img标签的src，如“data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/…2wBDAAYEBQYFBAY”;
result.clearBase64:不带图片类型的编码，如“/9j/4AAQSkZJRgABAQAAAQABAAD/…2wBDAAYEBQYFBAY”
*/
$(imgId).attr('src' , img.src);
$(ts).addClass('active');
}
})
}
//上传base64位的图片
function doUploadByBase64(name,baseStr,ts,type,card) {
fnBase.loadShow()
$('.loading').css('z-index','99999')
sessionStorage.b64data=baseStr;
var obj = new Object();
obj.name = name;
obj.base64 =baseStr;
sessionStorage.setItem(card,baseStr);
obj.type = type;
console.log(obj)
$.ajax({
url:'/upload',
type:'POST',
contentType:"application/json",
data:JSON.stringify(obj),
success:function(result){
//如果返回{code:0}，则跳转页面
if(result.code=='0'){
fnBase.loadHide()
$(ts).removeClass('active');
window.location.href="addDP.html";
//window.location.href="route?des="+result.des;
sessionStorage.setItem("data",result.data);
sessionStorage.setItem("dlimgpath",result.imgpath);
}else{
fnBase.myalert(result.errinfo);
}
}
});
}
</script>
</html>
git地址：https://github.com/zhangstar1331/upload-picture.git