<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta id="viewport" name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"> <title>WeUI-Uploader</title> <link rel="stylesheet" href="https://res.wx.qq.com/open/libs/weui/0.3.0/weui.css" /> </head> <body> <div class="container"> <div class="weui_cells_title">上传</div> <div class="weui_cells weui_cells_form"> <div class="weui_cell"> <div class="weui_cell_bd weui_cell_primary"> <div class="weui_uploader"> <div class="weui_uploader_hd weui_cell"> <div class="weui_cell_bd weui_cell_primary">图片上传</div> <div class="weui_cell_ft js_counter">0/6</div> </div> <div class="weui_uploader_bd"> <ul class="weui_uploader_files"> <!-- 预览图插入到这 --> </ul> <div class="weui_uploader_input_wrp"> <input class="weui_uploader_input js_file" type="file" accept="image/jpg,image/jpeg,image/png,image/gif" multiple=""></div> </div> </div> </div> </div> </div> </div> <div class="weui_dialog_alert" style="display: none;"> <div class="weui_mask"></div> <div class="weui_dialog"> <div class="weui_dialog_hd"> <strong class="weui_dialog_title">警告</strong> </div> <div class="weui_dialog_bd">弹窗内容，告知当前页面信息等</div> <div class="weui_dialog_ft"> <a href="javascript:;" class="weui_btn_dialog primary">确定</a> </div> </div> </div> <script src="https://cdn.bootcss.com/zepto/1.1.6/zepto.min.js"></script> </body> </html> <script> $.weui = {}; $.weui.alert = function(options){ options = $.extend({title: '警告', text: '警告内容'}, options); var $alert = $('.weui_dialog_alert'); $alert.find('.weui_dialog_title').text(options.title); $alert.find('.weui_dialog_bd').text(options.text); $alert.on('touchend click', '.weui_btn_dialog', function(){ $alert.hide(); }); $alert.show(); }; $(function () { // 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'}); 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 = $('<li class="weui_uploader_file weui_uploader_status" style="background-image:url(' + base64 + ')"><div class="weui_uploader_status_content">0%</div></li>'); $('.weui_uploader_files').append($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('<i class="weui_icon_warn"></i>'); $preview.removeClass('weui_uploader_status').find('.weui_uploader_status_content').remove(); } } setTimeout(uploading, 30); }; img.src = e.target.result; }; reader.readAsDataURL(file); } }); }); //# sourceURL=pen.js </script> </body> </html>
效果预览：
