嗨我試圖從jQuery使用jQuery標籤獲取圖像數據。如何從src屬性獲取圖像數據?
var imagedata = $('.avatar_store img').attr('src');
我收到未定義爲返回此imagedata.How閱讀本圖像用base64 BLOB format.Can請你幫我?提前致謝。
嗨我試圖從jQuery使用jQuery標籤獲取圖像數據。如何從src屬性獲取圖像數據?
var imagedata = $('.avatar_store img').attr('src');
我收到未定義爲返回此imagedata.How閱讀本圖像用base64 BLOB format.Can請你幫我?提前致謝。
HTML
<img id=imageid src=https://www.google.de/images/srpr/logo11w.png>
的JavaScript
function getBase64Image(img) {
var canvas = document.createElement("canvas");
canvas.width = img.width;
canvas.height = img.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0);
var dataURL = canvas.toDataURL("image/png");
return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
}
var base64 = getBase64Image(document.getElementById("imageid"));
來源
這很好,如果你添加一些解釋或更好過去鏈接你複製答案http://stackoverflow.com/questions/22172604/convert-image-url-to-base64/#answer-22172860 –
道歉@Satindersingh。從下次開始請記住。 –
所以這似乎工作,但瀏覽器給我一個關於污染的畫布的安全錯誤。有沒有辦法解決這個問題? – Rozgony
可以使用帆布得到的圖像數據:
var img = new Image();
img.crossOrigin = 'Anonymous';
img.onload = function() {
var canvas = 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);
console.log('base64', dataURL);
canvas.toBlob(function(blob) {
console.log('blob', blob);
});
};
img.src = $('.avatar_store img').attr('src');
添加烏爾標籤與此類avatar_store IMG –
你確定你得到的元素選擇器相匹配?檢查'$('。avatar_store img')。length' –
[canvas.toDataURL()SecurityError](http://stackoverflow.com/questions/20424279/canvas-todataurl-securityerror) –