在javascript中使用什么测量单位来处理文件大小？ [英] What measuring unit is used for file sizes in javascript?

问题描述

我正在尝试在上传到服务器之前在客户端验证文件大小。但是我认为我需要在javascript中计算max-size。

am trying to validate file size on the client side before uploading to server. However I think i need to calculate max-size in javascript.

那么如何在javascript中编写 4MB ？
我还想知道基本上用什么测量单位来计算javascript的文件大小。

So how do i write 4MB in javascript ? I would also want to know basically in what measuring unit is javascript calculated in terms of file size.

下面是我的colde：

below is my colde:

//Grab the file list
        var files   =   e.target.files;
        $.each(files,function(i,file){

        //check for the correct file extensiton
        var n   = file.name,
            s   = file.size
            t   = file.type;
        if(s > 4MB){

            console.log("File is greater than 4MB");

   }
}

请帮忙。谢谢。

推荐答案

文件大小以字节为单位 - 请执行以下操作：

The file size is measured in bytes - do this:

if (s > 4 * 1024 * 1024)
    alert("Too big");

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