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首页 / 移动开发 / Android / 移动端html5图片上传方法【更好的兼容安卓IOS和微信】

之前的移动端上传的方法,有些朋友测试说微信支持不是很好,还有部分安卓机也不支持,其实我已经有了另一个方法,但是例子还没整理出来,而联系我的很多朋友需要,所以就提前先发出来了,并且做一个简单的说明,就不做一个demo了。

<!doctype html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0"> <title>图片压缩</title> <style> body { margin:0; padding:0; } html { font-size:62.5%; }.imgzip { padding:1em; } .imgzip .itm { padding-bottom:1em; word-break:break-all; font-size:1.2rem; line-height:1.5em; } .imgzip .itm .tit { margin-bottom:.5em; background-color:#e71446; color:#FFF; padding:.5rem 1rem; border-radius:3px; } .imgzip .itm .cnt { padding:1rem; } .imgzip .itm .cnt img { display:block; max-width:100%; } .imgzip textarea { width:100%; height:20em; } </style> </head><body> <script src="http://code.jquery.com/jquery-1.8.3.js"></script> <input type="file" accept="image/*;capture=camera" class="input"> <div class="imgzip"></div> <script> document.addEventListener("DOMContentLoaded", init, false);function init() { var u = new UploadPic(); u.init({ input: document.querySelector(".input"), callback: function (base64) { $.ajax({ url:"{:U("upload")}", data:{str:base64,type:this.fileType}, type:"post", dataType:"json", success:function(i){ alert(i.info); } }) }, loading: function () {} }); }function UploadPic() { this.sw = 0; this.sh = 0; this.tw = 0; this.th = 0; this.scale = 0; this.maxWidth = 0; this.maxHeight = 0; this.maxSize = 0; this.fileSize = 0; this.fileDate = null; this.fileType = ""; this.fileName = ""; this.input = null; this.canvas = null; this.mime = {}; this.type = ""; this.callback = function () {}; this.loading = function () {}; }UploadPic.prototype.init = function (options) { this.maxWidth = options.maxWidth || 800; this.maxHeight = options.maxHeight || 600; this.maxSize = options.maxSize || 3 * 1024 * 1024; this.input = options.input; this.mime = {"png": "image/png", "jpg": "image/jpeg", "jpeg": "image/jpeg", "bmp": "image/bmp"}; this.callback = options.callback || function () {}; this.loading = options.loading || function () {};this._addEvent(); };/** * @description 绑定事件 * @param {Object} elm 元素 * @param {Function} fn 绑定函数 */ UploadPic.prototype._addEvent = function () { var _this = this;function tmpSelectFile(ev) { _this._handelSelectFile(ev); }this.input.addEventListener("change", tmpSelectFile, false); };/** * @description 绑定事件 * @param {Object} elm 元素 * @param {Function} fn 绑定函数 */ UploadPic.prototype._handelSelectFile = function (ev) { var file = ev.target.files[0];this.type = file.type// 如果没有文件类型,则通过后缀名判断(解决微信及360浏览器无法获取图片类型问题) if (!this.type) { this.type = this.mime[file.name.match(/.([^.]+)$/i)[1]]; }if (!/image.(png|jpg|jpeg|bmp)/.test(this.type)) { alert("选择的文件类型不是图片"); return; }if (file.size > this.maxSize) { alert("选择文件大于" + this.maxSize / 1024 / 1024 + "M,请重新选择"); return; }this.fileName = file.name; this.fileSize = file.size; this.fileType = this.type; this.fileDate = file.lastModifiedDate;this._readImage(file); };/** * @description 读取图片文件 * @param {Object} image 图片文件 */ UploadPic.prototype._readImage = function (file) { var _this = this;function tmpCreateImage(uri) { _this._createImage(uri); }this.loading();this._getURI(file, tmpCreateImage); };/** * @description 通过文件获得URI * @param {Object} file 文件 * @param {Function} callback 回调函数,返回文件对应URI * return {Bool} 返回false */ UploadPic.prototype._getURI = function (file, callback) { var reader = new FileReader(); var _this = this;function tmpLoad() { // 头不带图片格式,需填写格式 var re = /^data:base64,/; var ret = this.result + "";if (re.test(ret)) ret = ret.replace(re, "data:" + _this.mime[_this.fileType] + ";base64,");callback && callback(ret); }reader.onload = tmpLoad;reader.readAsDataURL(file);return false; };/** * @description 创建图片 * @param {Object} image 图片文件 */ UploadPic.prototype._createImage = function (uri) { var img = new Image(); var _this = this;function tmpLoad() { _this._drawImage(this); }img.onload = tmpLoad;img.src = uri; };/** * @description 创建Canvas将图片画至其中,并获得压缩后的文件 * @param {Object} img 图片文件 * @param {Number} width 图片最大宽度 * @param {Number} height 图片最大高度 * @param {Function} callback 回调函数,参数为图片base64编码 * return {Object} 返回压缩后的图片 */ UploadPic.prototype._drawImage = function (img, callback) { this.sw = img.width; this.sh = img.height; this.tw = img.width; this.th = img.height;this.scale = (this.tw / this.th).toFixed(2);if (this.sw > this.maxWidth) { this.sw = this.maxWidth; this.sh = Math.round(this.sw / this.scale); }if (this.sh > this.maxHeight) { this.sh = this.maxHeight; this.sw = Math.round(this.sh * this.scale); }this.canvas = document.createElement("canvas"); var ctx = this.canvas.getContext("2d");this.canvas.width = this.sw; this.canvas.height = this.sh;ctx.drawImage(img, 0, 0, img.width, img.height, 0, 0, this.sw, this.sh);this.callback(this.canvas.toDataURL(this.type));ctx.clearRect(0, 0, this.tw, this.th); this.canvas.width = 0; this.canvas.height = 0; this.canvas = null; }; </script> </body> </html>
这个也是把图片转成了base64去传送,个人不建议去用js改变图片的大小,建议裁切缩放还是PHP来做吧。
this.maxWidth = options.maxWidth || 800; this.maxHeight = options.maxHeight || 600; this.maxSize = options.maxSize || 3 * 1024 * 1024; this.input = options.input; this.mime = {"png": "image/png", "jpg": "image/jpeg", "jpeg": "image/jpeg", "bmp": "image/bmp"};
这一部分是对上传图片的配置,应该可以看懂,可以自己去改
$.ajax({ url:"{:U("upload")}", data:{str:base64,type:this.fileType}, type:"post", dataType:"json", success:function(i){ alert(i.info); }
这部分是上传以后ajax发送base64码到php,
base64码带有图片的说明字符串,所以得用正则去掉,然后base64解码保存到图片的文件中。并且返回地址即可
upload.php的内容

$str = $_POST["str"];$type = $_POST["type"]; switch($type){case "image/png":$ext=".png";break;case "image/jpeg";$ext=".jpeg";break;case "image/jpeg":$ext=".jpg";break;case "image/bmp":$ext=".bmp";break;default:$ext=".jpg";}$file_path="./Uploads/".date("Ymd")."/".time().$ext;if(!file_exists(dirname($file_path))){mkdir(dirname($file_path),0777,true);}$img_content = str_replace("data:".$type.";base64,","",$str);$img_content = base64_decode($img_content);$result =file_put_contents($file_path,$img_content);
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。