js canvas擷取圖片base64 dataUrl

標籤：圖片展示   ons   img   func   text   can   get   div   raw   

function getImgBase64(path,callback){        var img = new Image();        img.src = path;        //圖片載入完成後觸發        img.onload = function(){        var canvas = document.createElement("canvas");        //擷取繪畫上下文        ctx = canvas.getContext("2d");        // 擷取圖片寬高        var imgWidth = img.width;        var imgHeight = img.height;        //設定畫布寬高與圖片寬高相同        canvas.width = imgWidth;        canvas.height = imgHeight;        //繪製圖片        ctx.drawImage(img,0,0,imgWidth,imgHeight);        //圖片展示的 data URI        var dataUrl = canvas.toDataURL(‘image/jpeg‘);        callback ? callback(dataUrl) : ‘‘;        };        }        getImgBase64(‘wood.png‘,function(dataUrl){        console.log(dataUrl);        });

　　

js canvas擷取圖片base64 dataUrl