本文主要介紹了進制轉換函數，用於壓縮數字，比如Date.now()這樣的長數字，用62進制表示，就更短，大家參考使用吧
代碼如下: function zipNum(num, radix){ if(!zipNum.zip){ zipNum.zip = function(inputNum){ if(inputNum > 35){//用大寫字母表示36-61 return String.fromCharCode('A'.charCodeAt(0) + inputNum % 36); } else if(inputNum > 9){//用小寫字母表示10-35 return String.fromCharCode('a'.charCodeAt(0) + inputNum % 10); } else { return inputNum; } } } var quotient = num, remainder, result; if(radix > 36 && radix < 63){ result = []; do { remainder = quotient % radix; quotient = parseInt(quotient / radix); result.push(zipNum.zip(remainder)); }while(quotient > radix); remainder = quotient % radix; if(remainder !== 0){ result.push(zipNum.zip(remainder)); } result = result.reverse().join(''); } else if(radix > 1 && radix < 36){ result = num.toString(radix); } else { result = num; window.console && console.warn('radix argument must be between 2 and 62') } return result; } function testSortNum(){ assertEquals(zipNum(61, 62), 'Z'); assertEquals(zipNum(62 * 2 - 1, 62), '1Z'); assertEquals(zipNum(62 * 3 - 1, 62), '2Z'); assertEquals(zipNum(1361182624991, 62), 'dXN5fJB'); } testSortNum();