我通过http.post请求从服务器获取文件URL . 我需要将image转换为base64字符串以进行数据库存储 . 我使用角度进行离子2应用的解决方案
convertToDataURLviaCanvas(url, outputFormat){
return new Promise( (resolve, reject) => {
let img = new Image();
img.crossOrigin = 'Anonymous';
img.onload = function(){
let canvas = <HTMLCanvasElement> document.createElement('CANVAS'),
ctx = canvas.getContext('2d'),
dataURL;
canvas.height = this.height;
canvas.width = this.width;
ctx.drawImage(this, 0, 0);
dataURL = canvas.toDataURL(outputFormat);
//callback(dataURL);
canvas = null;
resolve(dataURL);
};
img.src = url;
});
}
并使用：
this.convertToDataURLviaCanvas(someUrl, "image/jpeg")
.then( base64Img => {
//do whatever you need here, with the base64 data
})
所以我需要转换使用angularjs离子等效代码..