Flash计算文件大小裁剪小数点与获取单位

作者: 嘎嘎 2010-08-16,12:16 上午周一

以前PHP写过一个类似的函数,现在换到AS3写,可以输入一个字节数的大小,可以输出类似于,5.03 KB,30.5 TB等这样的结果

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/**
* 给一个文件的大小,换算出大小
* @param bytes 文件的大小,字节数
* @param decimals = 1 小数点后的
* @return
*/
public static function getFileSize(bytes:Number, decimals = 1):String {
var FileSizeName:String = "Bytes";
var endBytes:Number;
if (bytes >= 1152921504606846976) {
FileSizeName = "EB";
endBytes = bytes / 1152921504606846976;
}else if (bytes >= 1125899906842624) {
FileSizeName = "PB";
endBytes = bytes / 1125899906842624;
}else if (bytes >= 1099511627776) {
FileSizeName = "TB";
endBytes = bytes / 1099511627776;
}else if (bytes >= 1073741824) {
FileSizeName = "GB";
endBytes = bytes / 1073741824;
}else if (bytes >= 1048576) {
FileSizeName = "MB";
endBytes = bytes / 1048576;
}else if (bytes >= 1024) {
FileSizeName = "KB";
endBytes = bytes / 1024;
}else {
return bytes + " " + FileSizeName;
}
var decimalsNum:Number = 1;
for (var i:int = 0; i < decimals; i++) {
decimalsNum = decimalsNum * 10;
}
endBytes = Math.round(endBytes * decimalsNum) / decimalsNum;
return endBytes + " " + FileSizeName;
}