<!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" rel="external nofollow" />
</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:;" rel="external nofollow" 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：
