4
378return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
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var dataURL = 'data:image/jpg;base64,1123'
console.log(dataURL.replace(/^data:image/(png|jpg);base64,/,""))
结果： 1123
一看就明白了
清除data:image/jpg;base64,或data:image/png;base64,开头的字符串
这正则就是匹配这个字符串：
"data:image/"+ ("png"或者"jpg") +";base64,"就是去掉base64前面的格式，意思和上面那位一样
将
data:image/png;base64,或者data:image/jpg;base64,替换为空字符串