[英]convert image to base64 using javascript
function convertImgToBase64(url){
var canvas = document.createElement('CANVAS');
var ctx = canvas.getContext('2d');
var img = new Image;
img.crossOrigin = 'Anonymous';
img.onload = function(){
canvas.height = img.height;
canvas.width = img.width;
ctx.drawImage(img,0,0);
var dataURL = canvas.toDataURL('image/png',"");
alert(dataURL);
canvas = null;
};
img.src = url;
}
var url_to_be_converted = "http://www.google.com/image/sample"
convertImgToBase64(url_to_be_converted);
Alert(dataURL)没有显示任何结果。那里没有弹出窗口吗? 如何解决呢?
哪里错了?
存在跨源问题...请尝试使用此功能
function convertImgToBase64(url)
{
var canvas = document.createElement('CANVAS');
img = document.createElement('img'),
img.src = url;
img.onload = function()
{
canvas.height = img.height;
canvas.width = img.width;
var dataURL = canvas.toDataURL('image/png');
alert(dataURL);
canvas = null;
};
}
我删除了上下文,并以另一种方式加载了图像
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