微信weui的uploader功能实现(html+js+php[tp3.2])

html

    
    

        
            
        
    



    

        
        

            

                

                    

                        
图片上传
                        
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js

$(function() {
    var $gallery = $("#gallery"),
        $galleryImg = $("#galleryImg"),
        $uploaderFiles = $("#uploaderFiles");

    // 允许上传的图片类型
    var allowTypes = ['image/jpg', 'image/jpeg', 'image/png', 'image/gif'];
    // 1024KB，也就是 1MB
    var maxSize = 1024 * 1024;
    // 图片最大宽度
    var maxWidth = 300;
    // 最大上传图片数量
    var maxCount = 6;
    $('.js_file').on('change', function (event) {
        var files = event.target.files;
        // 如果没有选中文件，直接返回
        if (files.length === 0) {
            return;
        }
        for (var i = 0, len = files.length; i < len; i++) {
            var file = files[i];
            var reader = new FileReader();
            // 如果类型不在允许的类型范围内
            if (allowTypes.indexOf(file.type) === -1) {
                $.weui.alert({text: '该类型不允许上传'});
                continue;
            }
            if (file.size > maxSize) {
                $.weui.alert({text: '图片太大，不允许上传'});
                continue;
            }
            if ($('.weui_uploader_file').length >= maxCount) {
                // $.weui.alert({text: '最多只能上传' + maxCount + '张图片'});

                layui.use('layer', function(){
                  var layer = layui.layer;
                  
                  layer.msg('最多只能上传' + maxCount + '张图片');
                });


                return;
            }
            reader.onload = function (e) {
                var img = new Image();
                img.onload = function () {
                    // 不要超出最大宽度
                    var w = Math.min(maxWidth, img.width);
                    // 高度按比例计算
                    var h = img.height * (w / img.width);
                    var canvas = document.createElement('canvas');
                    var ctx = canvas.getContext('2d');
                    // 设置 canvas 的宽度和高度
                    canvas.width = w;
                    canvas.height = h;
                    ctx.drawImage(img, 0, 0, w, h);
                    var base64 = canvas.toDataURL('image/png');
                    // 插入到预览区
                    var $preview = $('
0%
');
                    $('.weui_uploader_files').append($preview);
                    var num = $('.weui_uploader_file').length;
                    $('.js_counter').text(num + '/' + maxCount);
                    // 然后假装在上传，可以post base64格式，也可以构造blob对象上传，也可以用微信JSSDK上传
                    var progress = 0;
                    function uploading() {
                        $preview.find('.weui_uploader_status_content').text(++progress + '%');
                        if (progress < 100) {
                            setTimeout(uploading, 30);
                        }
                        else {
                            // 如果是失败，塞一个失败图标
                            //$preview.find('.weui_uploader_status_content').html('');
                            $preview.removeClass('weui_uploader_status').find('.weui_uploader_status_content').remove();
                        }
                    }
                    setTimeout(uploading, 30);
                };
                img.src = e.target.result;
                $.post("{:U('pyq/upload')}", { img: e.target.result},function(res){
                    if(res.img!=''){
                        // alert('upload success');
                        $('#image-all').val($('#image-all').val() + res.img + ',');
                    }else{
                        alert('upload fail');
                    }
                },'json');
            };
            reader.readAsDataURL(file);
        }
    });

    $uploaderFiles.on("click", "li", function() {
        $galleryImg.attr("style", this.getAttribute("style"));
        $gallery.fadeIn(100);
    });
    $gallery.on("click", function() {
        $gallery.fadeOut(100);
    });

    //删除图片
    var index; //第几张图片
    $uploaderFiles.on("click", "li", function() {

        index = $(this).index();
        $galleryImg.attr("style", this.getAttribute("style"));
        $gallery.fadeIn(100);

    });
    $gallery.on("click", function() {
        $gallery.fadeOut(100);
    });

    


    $(".weui-gallery__del").click(function() {

        //删除image-all中的值，index表示点击的第几张，同比删除
        var imageall = $('#image-all').val().split(',');
        //删除第index项，newimageall为删除的那一项，'["/Public/upload/test/201902/1549878149.jpg"]'
        var newimageall = imageall.splice(index, 1);
        
        //我们用ajax把后台中的文件删除掉。
        $.post("{:U('pyq/delupload')}", { img: newimageall[0]}, function(res){
            //如果status为2说明删除失败，这里在控制台输出一下，方便后期排查
            if(res['status'] == '2'){
                console.log('删除失败！');
            }else{
                var num = $('.weui_uploader_file').length;
                $('.js_counter').text(num + '/' + maxCount);
            }

        },'json');

        

        //把 imageall 数组用 ‘，’ 拼装起来
        var image_all_str = imageall.join(',');
        //重新设置 image-all中的值
        $('#image-all').val(image_all_str);

        //删除预览项
        $('#uploaderFiles li').eq(index).remove();
        
        $('.weui-uploader__input-box').show();

    });

    //提交
    $('#btnsaveCharge').click(function() {
        var duotu = $('#image-all').val();
        var content = $('#pyq_content').val();
        //如果多图为空，且内容为空，则不允许提交
        if( $('#pyq_content').val() == '' && $('#image-all').val() == ''){
            layui.use('layer', function(){
              var layer = layui.layer;
              
              layer.msg('请填写内容或者添加图片！');
            });
            return false;
        }

        var data = {duotu: duotu, content: content};
        var url = "{:U('pyq/zadd')}";
        $.post(url, data, function(result) {
            new_result = $.parseJSON(result);

            if (new_result.status == 0) {
                layui.use('layer', function(){
                  var layer = layui.layer;
                  
                  layer.msg(new_result.message);
                });              
            }
            if (new_result.status == 1) {
                
                layui.use('layer', function(){
                  var layer = layui.layer;
                  
                  layer.msg(new_result.message, { icon: 1, time: 1000 }, function() {
                      window.location.href = "{:U('pyq/index')}";
                  });
                });              
            }
        });

    })
});

php

public function upload()
{
    if (!empty($_POST)) {
        $img = isset($_POST['img']) ? $_POST['img'] : '';
        // 获取图片
        list($type, $data) = explode(',', $img);
        // 判断类型
        if (strstr($type, 'image/jpeg') != '') {
            $ext = '.jpg';
        } elseif (strstr($type, 'image/gif') != '') {
            $ext = '.gif';
        } elseif (strstr($type, 'image/png') != '') {
            $ext = '.png';
        }
        //保存路径设置
        $conf = array(
            'rootPath' => './Public/upload/',
            'savePath' => 'test/',
            'subName'  => date('Ym'),
        );
        $path = $conf['rootPath'] . $conf['savePath'] . $conf['subName'] . '/';
        //如果路径文件夹不存在，就建立文件夹
        if (!is_dir($path)) {
            $flag = mkdir($path, 0777, true);
        }
        //文件名通过这种方式达到不一致，不然一次性选择多张图片，只会显示最后一张
        $imgfont = time() + rand(1, 10000);
        // 生成的文件名
        $photo = $path . $imgfont . $ext;
        // 生成文件
        file_put_contents($photo, base64_decode($data));
        //原图很大，制作小图然后删除原图
        $im = new \Think\Image();
        //   $photo == ./Public/upload/test/201902/1549936204.jpg
        //打开全图
        $im->open($photo);
        //为原图制作 小图
        $im->thumb(1000, 1000);
        //保存
        $smallpic = $path . 'sm_' . $imgfont . $ext;
        $sm       = $im->save($smallpic);
        //删除原图
        unlink($photo);
        //将$photo前面的'.'去掉
        $smallpic = ltrim($smallpic, '.');
        // 返回
        header('content-type:application/json;charset=utf-8');
        $res = array('img' => $smallpic);
        echo json_encode($res);
    } else {
        $this->display();
    }
}

//删除已经上传的文件
public function delupload()
{
    if (!empty($_POST)) {
        $img = isset($_POST['img']) ? $_POST['img'] : '';

        //删除已经上传的文件
        $flag = unlink('.' . $img);

        if ($flag) {
            return show(1, '删除成功！');
        } else {
            return show(2, '删除失败！');
        }

    }
}