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判断图片格式

//文件路径
var filePath = "file:///storage/emulated/0/opmark/User/Pic/hangge.png";

function isAssetTypeAnImage(url) {
  //获取最后一个.的位置
  var index = url.lastIndexOf(".");
  //获取后缀
  var ext = url.substr(index + 1);

  return (
    ["png", "jpg", "jpeg", "bmp", "gif", "webp", "psd", "svg", "tiff"].indexOf(
      ext.toLowerCase()
    ) !== -1
  );
}

//判断是否是图片
console.log("该文件是否为图片：" + isAssetTypeAnImage(filePath));

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