php + jq + jq.from + ajax 无刷新上传图片

找了很久很久以前用过后来忘了最近写企业站上传要自己写大写的坑、上传代码
php

<?php
$action = $_GET['act']; 
if($action=='delimg'){ //删除图片 
    $filename = $_POST['imagename']; 
    if(!empty($filename)){ 
        unlink('files/'.$filename); 
        echo '1'; 
    }else{ 
        echo '删除失败.'; 
    } 
}else{ //上传图片 
    $picname = $_FILES['mypic']['name']; 
    $picsize = $_FILES['mypic']['size']; 
    if ($picname != "") { 
        if ($picsize > 512000) { //限制上传大小 
            echo '图片大小不能超过500k'; 
            exit; 
        } 
        $type = strrchr($picname, '.'); //限制上传格式 
        if ($type != ".gif" && $type != ".jpg"&& $type != ".png") { 
            echo '图片格式不对！'; 
            exit; 
        } 
        $rand = rand(100, 999); 
        $pics = date("YmdHis") . $rand . $type; //命名图片名称 
        //上传路径 
        $pic_path = "files/". $pics; 
        move_uploaded_file($_FILES['mypic']['tmp_name'], $pic_path); 
    } 
    $size = round($picsize/1024,2); //转换成kb 
    $arr = array( 
        'name'=>$picname, 
        'pic'=>$pics, 
        'size'=>$size 
    ); 
    echo json_encode($arr); //输出json数据 
}

html

<!DOCTYPE html>
<!-- release v4.3.6, copyright 2014 - 2017 Kartik Visweswaran -->
<html lang="en">
    <head>
        <meta charset="UTF-8"/>
        <title>Krajee JQuery Plugins - &copy; Kartik</title>
        <style type="text/css">
        .btn{position: relative;overflow: hidden;margin-right: 4px;display:inline-block; 
        *display:inline;padding:4px 10px 4px;font-size:14px;line-height:18px; 
        *line-height:20px;color:#fff; 
        text-align:center;vertical-align:middle;cursor:pointer;background:#5bb75b; 
        border:1px solid #cccccc;border-color:#e6e6e6 #e6e6e6 #bfbfbf; 
        border-bottom-color:#b3b3b3;-webkit-border-radius:4px; 
        -moz-border-radius:4px;border-radius:4px;} 
        .btn input{position: absolute;top: 0; right: 0;margin: 0;border:solid transparent; 
        opacity: 0;filter:alpha(opacity=0); cursor: pointer;} 
        .progress{position:relative; margin-left:100px; margin-top:-24px;  
        width:200px;padding: 1px; border-radius:3px; display:none} 
        .bar {background-color: green; display:block; width:0%; height:20px;  
        border-radius:3px; } 
        .percent{position:absolute; height:20px; display:inline-block;  
        top:3px; left:2%; color:#fff } 
        .files{height:22px; line-height:22px; margin:10px 0} 
        .delimg{margin-left:20px; color:#090; cursor:pointer}
        </style>        
    </head>
    <body>
    <div class="btn"> 
     <span>添加附件</span> 
     <input id="fileupload" type="file" name="mypic"> 
</div> 
<div class="progress"> 
    <span class="bar"></span><span class="percent">0%</span > 
</div> 
<div class="files"></div> 
<div id="showimg"></div> 
</body>
  <script type="text/javascript" src="jquery.min.js"></script> 
<script type="text/javascript" src="jquery.form.js"></script> 

<script>
    $(function () { 
    var bar = $('.bar'); 
    var percent = $('.percent'); 
    var showimg = $('#showimg'); 
    var progress = $(".progress"); 
    var files = $(".files"); 
    var btn = $(".btn span"); 
    $("#fileupload").wrap("<form id='myupload' action='action.php' method='post' enctype='multipart/form-data'></form>"); 
    $("#fileupload").change(function(){ //选择文件 
        $("#myupload").ajaxSubmit({ 
            dataType:  'json', //数据格式为json 
            beforeSend: function() { //开始上传 
                showimg.empty(); //清空显示的图片 
                progress.show(); //显示进度条 
                var percentVal = '0%'; //开始进度为0% 
                bar.width(percentVal); //进度条的宽度 
                percent.html(percentVal); //显示进度为0% 
                btn.html("上传中..."); //上传按钮显示上传中 
            }, 
            uploadProgress: function(event, position, total, percentComplete) { 
                var percentVal = percentComplete + '%'; //获得进度 
                bar.width(percentVal); //上传进度条宽度变宽 
                percent.html(percentVal); //显示上传进度百分比 
            }, 
            success: function(data) { //成功 
                //获得后台返回的json数据，显示文件名，大小，以及删除按钮 
                files.html("<b>"+data.name+"("+data.size+"k)</b> <span class='delimg' rel='"+data.pic+"'>删除</span>"); 
                //显示上传后的图片 
                var img = "http://www.lzi.com/files/"+data.pic; 
                showimg.html("<img style='height:100px' src='"+img+"'>"); 
                btn.html("添加附件"); //上传按钮还原 
                 $(".delimg").on('click',function(){ 
                        var pic = $(this).attr("rel"); 
                        $.post("action.php?act=delimg",{imagename:pic},function(msg){ 
                            if(msg==1){ 
                                files.html("删除成功."); 
                                showimg.empty(); //清空图片 
                                progress.hide(); //隐藏进度条 
                            }else{ 
                                alert(msg); 
                            } 
                        }); 
                    }); 
            }, 
            error:function(xhr){ //上传失败 
                btn.html("上传失败"); 
                bar.width('0'); 
                files.html(xhr.responseText); //返回失败信息 
            } 
        }); 
    }); 
}); 


    </script>
</html>

最后附上 jquery.form.js 下载地址

pmlptf

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php + jq + jq.from + ajax 无刷新上传图片

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