如何使用javascript获取以兆字节为单位的文件大小？

Question

如何创建验证大小的函数。请参阅以下代码：

    var filename = $(this).get(0).files; //e.g. 2MB
    var maxFileSize = 10; //in megabytes (MB)
    IsFileSizeValid(file, maxFileSize); //returns true or false

    //Check file size is valid 
    function IsFileSizeValid(filename, maxFileSize) {
        /*TODO*/
    }

Answer 1

$(this).get(0).files[0].size/1048576 - 以字节为单位获取第一个文件大小
1048576 - 在MiB中，2^20为1024^2或ViewGroup headerView = (ViewGroup) inflater.inflate(R.layout.item_header, list, true); list.addHeaderView(headerView); list.setAdapter(musicBaseAdapter); list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { final Intent intent = new Intent(getActivity(), RedActivity.class); intent.putExtra("rank", position); startActivity(intent); } }); headerView.setOnClickListener(new ViewGroup.OnClickListener() { @Override public void onClick(View v) { switch (v.getId()) { case R.id.text1: log.d("text1"); break; case R.id.text2: log.d("text2"); break; case R.id.text3: break; case R.id.text4: break; } } });