头像上传

app/js/picture-upload.js

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mui.plusReady(function() {
	var img_obj = document.querySelector("#canvas_img");
	var canvas_ok = document.querySelector("#canvas_ok");
	var list = plus.webview.currentWebview();
	var userId = plus.storage.getItem('userid');
	img_obj.setAttribute("src", list.imgurl);
	canvas_ok.addEventListener("tap", function() {
		save_img();
		imgOk = document.querySelector("#img_base64").value;
		imgfh = document.querySelector("#imgfh").value;
		console.log(imgfh)
		mui.ajax(baseUrl + '/ajax/image/saveHead', {
			data: {
				"id": userId,
				"base64": imgOk,
			},
			dataType: 'json', //数据格式类型
			type: 'post', //http请求类型
			timeout: 10000,
			success: function(data) {
				console.log(JSON.stringify(data));
				console.log(data.success);
				plus.nativeUI.toast("图片上传成功", toastStyle);
				mui.currentWebview.close();
				mui.back();
				var fPage = plus.webview.getWebviewById('../html/fillinfo.html');
				mui.fire(fPage, 'closePage', {
					id: imgfh
				});
			},
			error: function(data) {
				plus.nativeUI.toast("服务器链接超时", toastStyle);
			}
		});
	})
})
//获取手机屏幕宽高
var c_w = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
var c_h = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
var can_obj = document.querySelector("#canvas");
var img_obj = document.querySelector("#canvas_img");
var div_obj = document.querySelector("#canvas_div");
var posX = 0,
	posY = 0; //相对坐标
var scale = 0; //记录在缩放动作执行前的 缩放值
var start_X1 = 0,
	start_Y1 = 0,
	start_X2 = 0,
	start_Y2 = 0;
var start_sqrt = 0; //开始缩放比例
var sqrt = 1;
var left_x = 0,
	left_y = 0; //计算 偏移量 设置画布中的X，Y轴 (加偏移量)
function load() {
	//设置canvas 宽度（全屏显示），高度,上下居中显示
	can_obj.width = c_w - 50;
	can_obj.height = c_w - 50;
	can_obj.style.top = (c_h - c_w - 2) / 2 + "px";
	// can_obj.style.left ="25px";
	//设置图片自适应大小及图片的居中显示
	// autoResizeImage(c_w,c_h,img_obj);
	// img_obj.style.top = (c_h - img_obj.height - 2) / 2 + "px";
	//img_obj.style.left = (c_w - img_obj.width) / 2 + "px";
	document.querySelector("#canvas_div").addEventListener('touchstart', touch, false);
	document.querySelector("#canvas_div").addEventListener('touchmove', touch, false);
	document.querySelector("#canvas_div").addEventListener('touchend', touch, false);
	var ctx_img = can_obj.getContext("2d");
	var ctx_X = (can_obj.width - img_obj.width) / 2,
		ctx_Y = (can_obj.height - img_obj.height) / 2;
	ctx_img.drawImage(img_obj, ctx_X, ctx_Y, img_obj.width, img_obj.height); //初始化 canvas 加入图片
	function touch(event) {
		var event = event || window.event;
		event.preventDefault(); //阻止浏览器或body 其他冒泡事件
		var mv_x1 = event.changedTouches[0].clientX,
			mv_y1 = event.changedTouches[0].clientY; //手指坐标
		var img_left = img_obj.left,
			img_top = img_obj.top; //图片坐标
		if(event.touches.length == 1) { //单指操作
			if(event.type == "touchstart") { //开始移动
				posX = mv_x1 - img_obj.offsetLeft; //获取img相对坐标
				posY = mv_y1 - img_obj.offsetTop;
			} else if(event.type == "touchmove") { //移动中
				var _x = mv_x1 - posX; //移动坐标
				var _y = mv_y1 - posY;
				img_obj.style.left = _x + "px";
				img_obj.style.top = _y + "px";
				ctx_img.clearRect(0, 0, can_obj.width, can_obj.height); //清除画布
				ctx_img.drawImage(img_obj, _x + left_x / 2 - 25, _y - parseFloat(can_obj.style.top) + left_y / 2, img_obj.width * sqrt, img_obj.height * sqrt); //画布内图片移动
			}
		} else if(event.touches.length == 2) { //双指操作
			if(event.type == "touchstart") {
				scale = img_obj.style.Transform == undefined ? 1 : parseFloat(img_obj.style.Transform.replace(/[^0-9^\.]/g, "")); //获取在手指按下瞬间的放大缩小值（scale），作用，在移动时，记录上次移动的放大缩小值
				start_X1 = event.touches[0].clientX; //记录开始的坐标值,作用：在下次放大缩小后，去掉上次放大或缩小的值
				start_Y1 = event.touches[0].clientY;
				start_X2 = event.touches[1].clientX;
				start_Y2 = event.touches[1].clientY;
				start_sqrt = Math.sqrt((start_X2 - start_X1) * (start_X2 - start_X1) + (start_Y2 - start_Y1) * (start_Y2 - start_Y1)) / 200; //获取在缩放时 当前缩放的值
			} else if(event.type == "touchmove") {
				var mv_x2 = event.touches[1].clientX,
					mv_y2 = event.touches[1].clientY;
				var move_sqrt = Math.sqrt((mv_x2 - mv_x1) * (mv_x2 - mv_x1) + (mv_y2 - mv_y1) * (mv_y2 - mv_y1)) / 200; //动态获取上一次缩放值(随时变更)，在下次缩放时减去上一次的值，作用：防止累加之前的缩放
				sqrt = move_sqrt - start_sqrt + scale; //求出缩放值
				img_obj.style.webkitTransform = "scale(" + sqrt + ")"; //设置放大缩小
				img_obj.style.Transform = "scale(" + sqrt + ")";
				ctx_img.clearRect(0, 0, can_obj.width, can_obj.height); //清除画布
				var dImg_left = parseFloat(img_obj.style.left.replace("px", "")),
					dImg_top = parseFloat(img_obj.style.top.replace("px", ""));
				var w = img_obj.width,
					h = img_obj.height,
					sw = w * sqrt,
					sh = h * sqrt;
				left_x = w - sw; //计算 偏移量 设置画布中的X，Y轴 (加偏移量) 注：canvas 原点放大（canvas中图片左上角坐标），css3 scale 中点放大
				left_y = h - sh;
				ctx_img.drawImage(img_obj, dImg_left + left_x / 2 - 25, dImg_top - parseFloat(can_obj.style.top.replace("px", "")) + left_y / 2, sw, sh); //画布内图片重置
			}
		}
	}
}
window.addEventListener('load', load, false);
//裁图
function save_img() {
	var base64 = can_obj.toDataURL("image/jpeg", 1);
	var subbase = base64.substring(22);
	document.querySelector("#img_base64").value = subbase;
	document.querySelector("#imgfh").value = base64;
}