var img_photo='';

function selectFileImage(fileObj) {

var formdata = new FormData();

var file = fileObj.files['0'];

var Orientation = null;

if (file) {

console.log("正在上传,请稍后...");

var rFilter = /^(image/jpeg|image/png)$/i; // 检查图片格式

if (!rFilter.test(file.type)) {

//showMyTips("请选择jpeg、png格式的图片", false);

return;

}

// var URL = URL || webkitURL;

//获取照片方向角属性，用户旋转控制

EXIF.getData(file, function() {

// alert(EXIF.pretty(this));

EXIF.getAllTags(this);

//alert(EXIF.getTag(this, 'Orientation'));

Orientation = EXIF.getTag(this, 'Orientation');

//return;

});

var oReader = new FileReader();

oReader.onload = function(e) {

//var blob = URL.createObjectURL(file);

//_compress(blob, file, basePath);

var image = new Image();

image.crossOrigin = 'Anonymous'; //解决跨域

image.src = e.target.result;

image.onload = function() {

var expectWidth = this.naturalWidth;

var expectHeight = this.naturalHeight;

if (this.naturalWidth > this.naturalHeight && this.naturalWidth > 800) {

expectWidth = 800;

expectHeight = expectWidth * this.naturalHeight / this.naturalWidth;

} else if (this.naturalHeight > this.naturalWidth && this.naturalHeight > 1200) {

expectHeight = 1200;

expectWidth = expectHeight * this.naturalWidth / this.naturalHeight;

}

var canvas = document.createElement("canvas");

var context = canvas.getContext("2d");

var base63 = null;

//修复ios

if (navigator.userAgent.match(/iphone/i)) {

console.log('iphone');

//alert(expectWidth + ',' + expectHeight);

//如果方向角不为1，都需要进行旋转 added by lzk

if(Orientation != "" && Orientation != 1){

//alert('旋转处理');

switch(Orientation){

case 6://需要顺时针(向左)90度旋转

rotateImg(this,'left',canvas);

break;

case 8://需要逆时针(向右)90度旋转

rotateImg(this,'right',canvas);

break;

case 3://需要180度旋转

rotateImg(this,'right',canvas);//转两次

rotateImg(this,'right',canvas);

break;

}

}

base63 = canvas.toDataURL("image/jpeg", 0.8);

}else{

//alert(Orientation);

if(Orientation != "" && Orientation != 1){

//alert('旋转处理');

switch(Orientation){

case 6://需要顺时针(向左)90度旋转

rotateImg(this,'left',canvas);

break;

case 8://需要逆时针(向右)90度旋转

rotateImg(this,'right',canvas);

break;

case 3://需要180度旋转

rotateImg(this,'right',canvas);//转两次

rotateImg(this,'right',canvas);

break;

}

}

base63 = canvas.toDataURL("image/jpeg", 0.8);

}

//uploadImage(base64);

img_photo=base63;

//哪里需要用到上传的图片就放到对应的src下

$("myImage").attr("src", img_photo);

};

};

oReader.readAsDataURL(file);

}

}

//对图片旋转处理 added by lzk

function rotateImg(img, direction,canvas) {

//alert(img);

//最小与最大旋转方向，图片旋转4次后回到原方向

var min_step = 0;

var max_step = 3;

//var img = document.getElementById(pid);

if (img == null)return;

//img的高度和宽度不能在img元素隐藏后获取，否则会出错

var height = img.height;

var width = img.width;

//var step = img.getAttribute('step');

var step = 2;

if (step == null) {

step = min_step;

}

if (direction == 'right') {

step++;

//旋转到原位置，即超过最大值

step > max_step && (step = min_step);

} else {

step--;

step < min_step && (step = max_step);

}

//img.setAttribute('step', step);

/*var canvas = document.getElementById('pic_' + pid);

if (canvas == null) {

img.style.display = 'none';

canvas = document.createElement('canvas');

canvas.setAttribute('id', 'pic_' + pid);

img.parentNode.appendChild(canvas);

} */

//旋转角度以弧度值为参数

var degree = step * 90 * Math.PI / 180;

var context = canvas.getContext('2d');

switch (step) {

case 0:

canvas.width = width;

canvas.height = height;

context.drawImage(img, 0, 0);

break;

case 1:

canvas.width = height;

canvas.height = width;

context.rotate(degree);

context.drawImage(img, 0, -height);

break;

case 2:

canvas.width = width;

canvas.height = height;

context.rotate(degree);

context.drawImage(img, -width, -height);

break;

case 3:

canvas.width = height;

canvas.height = width;

context.rotate(degree);

context.drawImage(img, -width, 0);

break;

}

}