本文實例為大家分享了ajax上傳圖片到PHP并壓縮圖片顯示的具體代碼，供大家參考，具體內容如下

需求就是，上傳圖片并壓縮圖片頁面效果如下圖：

HTML代碼

<div id="main">  <div class="demo">   <div class="btn btn-success">    <span>上傳圖片</span>    <input id="fileupload" type="file" name="mypic">   </div>   <!--加載進度-->   <div class="progress progress-striped">    <span class="progress-bar progress-bar-success bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style=""></span>    <span class="percent">0%</span >   </div>   <!--顯示圖片-->   <div id="showimg"></div>   <!--刪除圖片-->   <div class="files"></div>  </div> </div> 

CSS代碼和引入的bootstrap

<style type="text/css">  .demo{width:580px; margin:30px auto}  .btn{position: relative;overflow: hidden;margin-right: 4px;}  .btn input {position: absolute;top: 0; right: 0;margin: 0;border: solid transparent;opacity: 0;filter:alpha(opacity=0);}  .progress { position:relative; margin-left:100px; margin-top:-24px; width:200px; border-radius:3px; display:none}  .percent { position:absolute; top:1px; left:2%; color:#fff }  .files{margin:10px 0}  .delimg{margin-left:20px; color:#090; cursor:pointer;margin-top: -6px;} </style> <!--bootstrap.css3.3.7--> <link rel="stylesheet"  integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> 

JS代碼

<!--jquery1.8.1-->  <script src="http://code.jquery.com/jquery-1.8.1.min.js"></script>  <!--圖片jquery.form.js-->  <script type="text/javascript" src="https://www.helloweba.net/demo/upload/jquery.form.js"></script> <script type="text/javascript">  $(function () {   //進度條百分比加載顏色   var bar = $('.bar');   //進度條百分比   var percent = $('.percent');   //圖片顯示   var showimg = $('#showimg');   //進度條   var progress = $(".progress");   //新增   var files = $(".files");   var btn = $(".btn span");   $(".demo").wrap("<form id='myupload' action='action.php' method='post' enctype='multipart/form-data'></form>");   //點擊上傳圖片   $("#fileupload").change(function(){    //提交表單    $("#myupload").ajaxSubmit({     dataType: 'json',     beforeSend: function() {       //顯示進度條      progress.show();      //進度條為0      var percentVal = '0%';      bar.width(percentVal);      percent.html(percentVal);      btn.html("上傳中...");     },     //上傳進度     uploadProgress: function(event, position, total, percentComplete) {      //進度條加載長度數據是number型      var percentVal = percentComplete + '%';      bar.width(percentVal)      percent.html(percentVal);     },     success: function(data) {      //上傳成功返回參數      files.html("<b>"+data.name+"("+data.size+"k)</b> <span class='delimg btn btn-danger' rel='"+data.pic+"'>刪除</span>");      showimg.html("<img src='"+data.pic+"'>");      btn.html("上傳圖片");     },     error:function(xhr){      //上傳失敗      btn.html("上傳失敗");      bar.width('0')      files.html(xhr.responseText);     },     clearForm: true    });   });    //刪除圖片js   $(".delimg").live('click',function(){    //獲取圖片地址    var pic = $(this).attr("rel");    $.post("action.php?act=delimg",{imagename:pic},function(msg){     if(msg=='delete'){      files.html("刪除成功.");      //刪除圖片效果      showimg.empty();      //隱藏進度條      progress.hide();     }else{      alert(msg);     }    });   });  }); </script>