JS原生上传大文件显示进度条-php上传文件

2018-06-24 00:29:04来源：未知阅读 ()

在php.ini修改需要的大小：

upload_max_filesize = 8M
post_max_size = 10M
memory_limit = 20M

<!DOCTYPE html>
<html>
<head>
    <title>原生JS大文件显示进度条</title>
    <meta charset="UTF-8">
    <style type="text/css">
        #parent{position: relative;width: 500px;height:20px;border:1px solid #ccc;display: none;border-radius:20px}
        #child{position: absolute;width:0%;height:20px;background: #5FB878;display: none;line-height: 20px;color: #ffffff;font-size: 12px;border-radius:20px}
    </style>
    <script type="text/javascript">
        function $(id){
            return document.getElementById(id);
        }
    </script>
</head>
<body>
    <form action="" method="post">
        <div id="parent">
            <div id="child"></div>
        </div>
        <p>上传文件:<input type="file" name="file"></p>    
        <p><input type="submit" value="提交" id="submit"></p>
    </form>
    <script type="text/javascript">
        var oForm = document.getElementsByTagName('form')[0];
        var oSubmit = $('submit');
        //如果多个人同时提交这个表单的时候，由于是异步的请求，互不影响
        oSubmit.onclick = function(){
            try{
                var xhr = new XMLHttpRequest();
            }catch(e){
                var xhr = new ActiveXObject("Msxml2.XMLHTTP");
            }
            xhr.upload.onprogress = function(e){
                var ev = e || window.event;
                var percent = Math.floor((ev.loaded / ev.total)*100);        
                // console.log(percent);
                //将百分比显示到进度条
                $('parent').style.display = 'block';
                $('child').style.display = 'block';
                //将上传进度的百分比显示到child里面
                $('child').style.width = percent+'%';
                $('child').style.textAlign = 'center';
                $('child').innerHTML = percent+'%';
                //判断如果百分比到达100%时候，隐藏掉
                if(percent==100){
                    $('parent').style.display = 'none';
                    $('child').style.display = 'none';
                }
            }
            xhr.open('post','progress.php',true);
            var form = new FormData(oForm);
            xhr.send(form);
            xhr.onreadystatechange = function(){
                if(xhr.readyState==4 && xhr.status==200){
                    eval("var obj ="+xhr.responseText);
                    if(obj.status){
                        alert('上传成功');
                    }else{
                        alert('上传失败');
                    }
                }
            }
            //阻止表单提交
            return false;
        }
    </script>
</body>
</html>

<?php
    //开始上传
    //注意：文件是windows系统的文件，采用的gbk编码，php文件使用的是utf-8编码
    //我们不能直接修改文件的编码，只能临时修改一下php的编码
    $dst_file = $_FILES['file']['name'];
    $dst_file = iconv('utf-8', 'gbk', $dst_file);
    if(move_uploaded_file($_FILES['file']['tmp_name'],$dst_file)){
        $data['status'] = 1;
    }else{
        $data['status'] = 0;
    }
    echo json_encode($data);