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--- title: "Number" date: "2022-01-30T10:25:51.000Z" permalink: "/pages/extension/number/" --- # java.lang.Number的扩展方法,用于数值类型的扩展 # round * 入参:number:int 要保留的小数 * 返回值:Number * 函数说明:四舍五入保留N位小数 var value = 123.456d; return value.round(2); //123.46 # toFixed * 入参:number:int 要保留的小数 * 返回值:String * 函数说明:四舍五入保留N位小数(和JS一样,强制限制位数) var value = 123.456d; return value.toFixed(10); // "123.4560000000" # floor * 返回值:Number * 函数说明:向下取整 var value = 123.456d; return value.floor(); // 123; # ceil * 返回值:Number * 函数说明:向上取整 var value = 123.456d; return value.ceil(); // 124; # asPercent * 入参:number:int 要保留的小数 * 返回值:String * 函数说明:将数值转为百分比 var value = 0.1289999999; return value.asPercent(2); // "12.90%"

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