我得到这段代码通过PHP隐蔽大小字节。
现在我想使用JavaScript将这些大小转换为人类可读的大小。我尝试将这段代码转换为JavaScript，看起来像这样:
function formatSizeUnits(bytes){
if (bytes >= 1073741824) { bytes = (bytes / 1073741824).toFixed(2) + " GB"; }
else if (bytes >= 1048576) { bytes = (bytes / 1048576).toFixed(2) + " MB"; }
else if (bytes >= 1024) { bytes = (bytes / 1024).toFixed(2) + " KB"; }
else if (bytes > 1) { bytes = bytes + " bytes"; }
else if (bytes == 1) { bytes = bytes + " byte"; }
else { bytes = "0 bytes"; }
return bytes;
}
这是正确的做法吗?有没有更简单的方法?
只是稍微修改了@zayarTun答案的代码，以包括一个额外的参数，表示结果中的小数数(如果小数为零，则不需要显示像15.00 KB这样的结果，而是15 KB就足够了，这就是为什么我在parseFloat()中包装结果值)
bytesForHuman(bytes, decimals = 2) {
let units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB']
let i = 0
for (i; bytes > 1024; i++) {
bytes /= 1024;
}
return parseFloat(bytes.toFixed(decimals)) + ' ' + units[i]
}
@ al冰岛jm也给出了同样的答案，但以一种“更说教”的方式。谢谢!= D
function formatBytes(numBytes, decPlaces) {
/* Adjust the number of bytes informed for the most appropriate metric according
to its value.
Args:
numBytes (number): The number of bytes (integer);
decPlaces (Optional[number])): The number of decimal places (integer). If
it is "undefined" the value "2" will be adopted.
Returns:
string: The number adjusted together with the most appropriate metric. */
if (numBytes === 0) {
return "0 Bytes";
}
// NOTE: 1 KB is equal to 1024 Bytes. By Questor
// [Ref(s).: https://en.wikipedia.org/wiki/Kilobyte ]
var oneKByte = 1024;
// NOTE: Treats if the "decPlaces" is "undefined". If it is "undefined" the value
// "2" will be adopted. By Questor
if (decPlaces === undefined || decPlaces === "") {
decPlaces = 2;
}
var byteMtrcs = ["Bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
// Byte Metrics
// NOTE: Defines the factor for the number of bytes and the metric. By Questor
var mtrcNumbFactor = Math.floor(Math.log(numBytes) / Math.log(oneKByte));
// Metrics Number Factor
return parseFloat((numBytes / Math.pow(oneKByte, mtrcNumbFactor)).
toFixed(decPlaces)) + " " + byteMtrcs[mtrcNumbFactor];
}
我使用递归和分配水平变量为适当的单位。
函数getReadableByte(count, decimal=0, level=0) {
让unitList =[“字节”,“知识库”,“m”,“g”、“肺结核”,“PT”);
if (count >= 1024.0 && (level+1 < unitList.length)) {
返回getReadableByte(count/1024, decimal， ++level)
｝
返回' ${小数?(count).toFixed(decimal): Math.round(count)}${unitList[level]} '
｝
2) console.log (getReadableByte (120)
当与字节相关时，有两种真实的方法来表示大小，它们是SI单位(10^3)或IEC单位(2^10)。也有JEDEC，但他们的方法是模糊的和令人困惑的。我注意到其他示例有错误，例如使用KB而不是KB来表示千字节，因此我决定编写一个函数，使用当前接受的度量单位的范围来解决这些情况。
在结尾有一个格式化的地方，这将使数字看起来更好一点(至少在我看来)，如果它不适合你的目的，请随意删除这个格式。
享受。
// pBytes: the size in bytes to be converted.
// pUnits: 'si'|'iec' si units means the order of magnitude is 10^3, iec uses 2^10
function prettyNumber(pBytes, pUnits) {
// Handle some special cases
if(pBytes == 0) return '0 Bytes';
if(pBytes == 1) return '1 Byte';
if(pBytes == -1) return '-1 Byte';
var bytes = Math.abs(pBytes)
if(pUnits && pUnits.toLowerCase() && pUnits.toLowerCase() == 'si') {
// SI units use the Metric representation based on 10^3 as a order of magnitude
var orderOfMagnitude = Math.pow(10, 3);
var abbreviations = ['Bytes', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
} else {
// IEC units use 2^10 as an order of magnitude
var orderOfMagnitude = Math.pow(2, 10);
var abbreviations = ['Bytes', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
}
var i = Math.floor(Math.log(bytes) / Math.log(orderOfMagnitude));
var result = (bytes / Math.pow(orderOfMagnitude, i));
// This will get the sign right
if(pBytes < 0) {
result *= -1;
}
// This bit here is purely for show. it drops the percision on numbers greater than 100 before the units.
// it also always shows the full number of bytes if bytes is the unit.
if(result >= 99.995 || i==0) {
return result.toFixed(0) + ' ' + abbreviations[i];
} else {
return result.toFixed(2) + ' ' + abbreviations[i];
}
}
