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单位转换
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export class UnitConvertUtil { | |
/** | |
* 文件大小 例如 1024 -> 1 MB | |
* | |
* @param {*} value | |
* @param {number} fix | |
* @param {string} [base] | |
* @returns | |
* | |
* @memberOf UnitConvertUtil | |
*/ | |
toFilesize(value: any, fix: number, base?: string) { | |
return this.sizeFormatter(value, fix, base, 'B', 1024); | |
} | |
/** | |
* 带宽 例如 1024 -> 1 Mbps | |
* | |
* @param {*} value | |
* @param {number} fix | |
* @param {string} [base] | |
* @returns | |
* | |
* @memberOf UnitConvertUtil | |
*/ | |
toBandwidth(value: any, fix: number, base?: string) { | |
return this.sizeFormatter(value, fix, base, 'bps', 1024); | |
} | |
/** | |
* 流量 例如 1024 -> 1 Mb | |
* | |
* @param {*} value | |
* @param {number} fix | |
* @param {string} [base] | |
* @returns | |
* | |
* @memberOf UnitConvertUtil | |
*/ | |
toFlow(value: any, fix: number, base?: string) { | |
return this.sizeFormatter(value, fix, base, 'b', 1024); | |
} | |
/** | |
* 数字 例如 1000 -> 1 M | |
* | |
* @param {*} value | |
* @param {number} fix | |
* @returns | |
* | |
* @memberOf UnitConvertUtil | |
*/ | |
toCount(value: any, fix: number) { | |
return this.sizeFormatter(value, fix, undefined, undefined, 1000); | |
} | |
/** | |
* 百分比 例如 1.349 -> 1.35% | |
* | |
* @param {*} value | |
* @param {number} fix | |
* @returns | |
* | |
* @memberOf UnitConvertUtil | |
*/ | |
toPercent(value: any, fix: number = 2) { | |
let val = parseFloat(value); | |
if (val >= 0) { | |
return val.toFixed(fix) + '%'; | |
} else { | |
return ''; | |
} | |
} | |
/** | |
* 数字转换 例如 1024 -> 1 M | |
* | |
* @export | |
* @param {*} value 输入数字 | |
* @param {number} [fix=2] 小数点后保存位数 | |
* @param {string} [base=undefined] 默认量级 K | M | G | T | P | E | |
* @param {string} [unit=undefined] 默认单位 | |
* @returns | |
*/ | |
sizeFormatter(value: any, fix: number = 2, base: string, unit: string = '', gap: number = 1024) { | |
let val = parseFloat(value); | |
let unitIndex; | |
const units = ['', 'K', 'M', 'G', 'T', 'P', 'E']; | |
if (base) { | |
unitIndex = units.indexOf(base); | |
} else { | |
unitIndex = 0; | |
} | |
while (unitIndex < units.length - 1 && val >= gap) { | |
val /= gap; | |
unitIndex++; | |
} | |
if (Math.floor(val) < val) { | |
val = val.toFixed(fix) as any; | |
} | |
return `${val} ${units[unitIndex]}${unit}`; | |
} | |
} |
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