$(function(){
//这是网上的一张图片链接
var url="http://pic.c-ctrip.com/VacationH5Pic/mice/wechat/ewm01.png";
//var url="https://test-zyhuadu.oss-cn-beijing.aliyuncs.com/test02M.jpg";
getBase64(url).then(function(base64){
$('#box').html(base64);
$('.img_base64').attr('src',base64);
},function(err){
console.log(err);//打印异常信息
});
});
//传入图片路径，返回base64
function getBase64(img){
function getBase64Image(img,width,height) {//width、height调用时传入具体像素值，控制大小 ,不传则默认图像大小
var canvas = document.createElement("canvas");
canvas.width = width ? width : img.width;
canvas.height = height ? height : img.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
var dataURL = canvas.toDataURL();
return dataURL;
}
var image = new Image();
image.setAttribute("crossOrigin",'Anonymous');
image.src = img;
var deferred=$.Deferred();
if(img){
image.onload =function (){
deferred.resolve(getBase64Image(image));//将base64传给done上传处理
}
return deferred.promise();//问题要让onload完成后再return sessionStorage['imgTest']
}
};
