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假设我在服务器上有一个 .mp4 视频。我想在android手机上下载它,我该怎么做..请用一些代码指导我

<script>
function downloadImage(url,fileName){
var fileTransfer = new FileTransfer();
fileTransfer.download(
    url,
    window.rootFS.fullPath+ "/" + fileName,
    function(entry) {
        alert(\"download complete: \" + entry.fullPath);
    },
    function(error) {
        alert(\"download error\"+JSON.stringify(error));
    }
);

}

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