【js 必备工具代码段】,建议收藏!持续更新ing...
2023-04-02 本文已影响0人
简单单的
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(1) [].concat.apply([], 被拷贝的数组)
5. 按
(1) 过滤数组中值为
(1) [].slice.call(obj)
(2) Array.from(cArr)
1. 将被
3. 计算
4. 提取字符串中的
5. 提取字符串中的指定值(
文章更新于23/4/3
一、数组处理
1. 数组去重
1. 纯数组去重(6种方法)
class ArrayToHeavy {
// new Set去重
newSetHeavy(arr) {
return Array.from(new Set(arr))
}
// .indexOf或lastIndexOf去重
indexHeavy(arr) {
let newArr = [];
arr.forEach((val, index) => {
newArr.indexOf(val) === -1 ? newArr.push(val) : '';
});
return newArr
}
// 通过filter过滤返回一个新数组在原数组中对比用indexof去重
filterHeavy(arr) {
return arr.filter((item, index, self) => {
return self.indexOf(item) === index; //比较数组中每一项是否为其(indexof)首次查找的索引值(index)
})
}
// 通过splice改变原数组去重
spliceHeavy(arr) {
let len = arr.length;
for (let i = 0; i < len; i++) {
for (let j = i + 1; j < len; j++) {
if (arr[i] == arr[j]) {
arr.splice(j, 1);
len--;
j--
}
}
}
}
/* 相邻元素去重
这种方法首先调用了数组的排序方法sort(),然后根据排序后的结果进行遍历及相邻元素比对,
如果相等则跳过改元素,直到遍历结束 */
uniqueHeavy(arr) {
if (!Array.isArray(arr)) {
console.log('type error!')
return
}
arr = arr.sort()
let res = []
for (let i = 0; i < arr.length; i++) {
if (arr[i] !== arr[i - 1]) {
res.push(arr[i])
}
}
return res
}
/* 利用对象属性去重
创建空对象,遍历数组,将数组中的值设为对象的属性,并给该属性赋初始值1,
每出现一次,对应的属性值增加1,这样,属性值对应的就是该元素出现的次数了 */
ObjHeavy(arr) {
if (!Array.isArray(arr)) {
console.log('type error!')
return
}
let res = [],
obj = {}
for (let i = 0; i < arr.length; i++) {
if (!obj[arr[i]]) {
res.push(arr[i])
obj[arr[i]] = 1
} else {
obj[arr[i]]++
}
}
return res
}
}
const ArrayToHeavy_handle = new ArrayToHeavy()
console.log(ArrayToHeavy_handle.newSetHeavy([1, 1])) // [1]
2. 对象数组去重
1. 去重相同id的对象
let person = [
{ id: 0, name: "A" },
{ id: 0, name: "b" }
];
let obj = {};
let peon = person.reduce((cur, next) => {
obj[next.id] ? "" : (obj[next.id] = true && cur.push(next));
return cur;
}, []); //设置cur默认类型为数组,并且初始值为空的数组
peon // [{ id: 0, name: "A" }]
2. 数组排序10种实用方法
{1} 冒泡排序
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- 解释:冒泡排序算法就是依次比较大小,小的的大的进行位置上的交换。
- 实现原理:
当i=0的时候,里面的循环完整执行,从j=0执行到j=6,这也就是第一遍排序,结果是将最大的数排到了最后,这一遍循环结束后的结果应该是[8,34,21,53,12,95
当i=1的时候,里面的循环再次完整执行,由于最大的数已经在最后了,没有必要去比较数组的最后两项,这也是j<arr.length-1-i的巧妙之处,结果是[8,34,21,12,53,95]
说到这里,规律就清楚了,每次将剩下数组里面最大的一个数排到最后面,当第一个循环执行到最后的时候,也就是i=6,此时,j=0,只需要比较数组的第一和第二项,比较完毕,返回。
let arr=[8,95,34,21,53,12];
function sortarr(arr){
for(i=0;i<arr.length-1;i++){
for(j=0;j<arr.length-1-i;j++){
if(arr[j]>arr[j+1]){
var temp=arr[j];
arr[j]=arr[j+1];
arr[j+1]=temp;
}
}
}
return arr;
}
sortarr(arr); // [8,12,21,34,53,95]
(2) 选择排序
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- 解释:依次找到剩余元素最小值,放置排好序的末尾(第一个放在开头)
在时间复杂度上表现最稳定的排序算法之一,因为无论什么数据进去都是O(n²)的时间复杂度,所以用到它的时候,数据规模越小越好。唯一的好处可能就是不占用额外的内存空间
function selectionSort(arr) {
var len = arr.length;
var minIndex, temp;
for (var i = 0; i < len - 1; i++) {
minIndex = i;
for (var j = i + 1; j < len; j++) {
if (arr[j] < arr[minIndex]) { //寻找最小的数
minIndex = j; //将最小数的索引保存
}
}
temp = arr[i];
arr[i] = arr[minIndex];
arr[minIndex] = temp;
}
return arr;
}
3. 数组拷贝
(1) [].concat.apply([], 被拷贝的数组) 适合处理一维数组
let a = [1,2];
let b = [].concat.apply([], a);
b[0] = 0;
a // => [1, 2]
b // => [0, 2]
4.处理二维数组
(1) 将连续的二维数组中的对应索引项合并为一个数组,返回合并后的二维数组
输入:
var data = [
[2001, 10, 20],
[2002, 30 ,40],
[2003, 50 ,60]
]
输出:
[
[2001, 2002, 2003],
[10, 30, 50],
[20, 40, 60]
]
实现:
var getBarData = [];
data[0].map(item => {
getBarData.push([])
});
data.forEach((item, inx) => {
for(var i = 0; i < data[0].length; i++) {
getBarData[i].push(item[i])
}
})
5. 按指定条件
查找数组中的元素
(1) 查找数组最大值
输入: let a = [1,2,3,4]
输出: 4
1. 利用Math方法通过apply 将数组元素一个一个拆分开来,然后在传递到Math.max()方法中
Math.max.apply(null, a)
2. Math.max(...a)
3. 利用sort方法
let resultArr = a.sort(function(a, b) {
return b - a;
});
resultArr[0] // 5
6. 按指定条件过滤数组
(1) 过滤数组中值为 false
的值
输入: let a = [0,0,false,null,3]
输出: [3]
let b = a.filter(Boolean) // [3]
7. 类数组转为数组
(1) [].slice.call(obj) 或
Array.prototype.slice.call(obj) 或
Array.prototype.concat.apply([],obj)
[].slice.call({length:2,0:1,1:2}) // [1 ,2]
Array.prototype.concat.apply([],{length:1,0:1}) // [1]
(2) Array.from(cArr) 或
[...obj]
Array.from({length:1,0:1}) // [1]
8.扁平化数组
输入: var arr = [[[1,2,3],[[4,5,6]]]]
输出: [1,2,3,4,5,6]
(1) reduce递归法
var flatten = (arr) => {
return arr.reduce((pre, next) => {
return pre.concat(Array.isArray(next) ? flatten(next) : next);
}, [])
}
flatten(arr) // [1,2,3,4,5,6]
二、对象处理
1. 将对象转为数组
- 利用Object.keys()
const obj = {
"sex_wxx": "性别",
"income_wxx": "收入",
"age_wxx": "年龄"
};
let arr = [];
Object.keys(obj).forEach(v => {
let o = {};
o[v] = obj[v];
arr.push(o)
})
console.log(arr) // [{sex_wxx: '性别'}, {income_wxx: '收入'},{age_wxx: '年龄'}]
- 利用Object.entries()
Object.entries(obj).forEach(item => {
let o = {}
o[item[0]] = item[1]
arr.push(o)
})
- Object.keys()和map()结合
Object.keys(obj).map(v => { return v = {[v]: obj[v]} })
2. 递归对象获取value
var obj = { a:{w:1,y:2,x:3},
b:{s:4,j:5,x:6},
c:{car:7,cat:8,mao:9}
}
function f(s){
for(var i in s){
if(typeof s[i]=="object"){
f(s[i])
}else{
console.log(s[i]);
}
}
}
f(obj) // 1,2,3,4,5,6,7,8,9
3. 判断两个对象是否相等
Object.entries({name:1}).toString() === Object.entries({name:1}).toString() // true
4. 从一个对象条件匹配另一个对象
用过滤(filter)判断(every)每一项是否符合条件
let obj = {name: 'ops'}
let arr = [{name: 'q'}, {name: 'ops', kl: 'oop'}]
var _key= Object.keys(obj)
arr.filter(item=>_key.every(k=>obj[k]===item[k])) // {name: 'ops', kl: 'oop'}
5. 对象转为url参数拼接
输入:
{
a:1,
b:2
}
输出:
a=1&b=2
function obj2strUrl (obj) {
let str="";
for (let key in obj) {
str = `${str}${key}=${obj[key]}&`
};
str = str.substring(0, str.length-1);
return str;
}
反转:拼接的url参数转为对象
/**
* @param {string} url
* @returns {Object}
*/
function param2Obj(url) {
const search = decodeURIComponent(url.split('?')[1]).replace(/\+/g, ' ')
if (!search) {
return {}
}
const obj = {}
const searchArr = search.split('&')
searchArr.forEach(v => {
const index = v.indexOf('=')
if (index !== -1) {
const name = v.substring(0, index)
const val = v.substring(index + 1, v.length)
obj[name] = val
}
})
return obj
}
三、字符串处理
1. 将被字符串包裹的对象
转为js对象
输入 '{name: qwer, id: 1, ops: poi}',=> 输出 {name: 'qwer', id: '1', ops: 'poi'}
function strToObj(str) {
let arr = str.replace(/{|}|\s*/g, '').split(','),
obj = {}
arr.forEach(val => {
let i = val.indexOf(':')
obj[val.substr(0, i)] = val.substr(i + 1);
});
return obj
}
console.log(strToObj('{name: qwer, id: 1, ops: poi}')) => {name: 'qwer', id: '1', ops: 'poi'}
2. 格式化string/number类型的日期
let date = '20220408000009';
function f(str, type) {
let i = 0,_type = type || 'xxxx-xx-xx xx:xx:xx'
return _type.replace(/x/g, () => str[i++])
}
f(date)
3. 计算字符串宽度
(px)
// 1. 精确计算
function computedTextWidth (text) {
var canvas = document.createElement('canvas');
canvas.id = 'computedTextWidth';
canvas.style.cssText = 'visibility:hidden;position: absolute;left: -999em;top:-999em;';
document.body.appendChild(canvas);
var context = canvas.getContext('2d');
context.font = '12px';
context.fillText(text, 0, 0);
return context.measureText(text).width;
}
computedTextWidth('33333333') // 100
// 2. 误差计算(差值为1/4)
computedTextWidth(text, fontSize = 14) {
let span = document.getElementById('computedTextWidth');
if (!span) {
span = document.createElement('span');
span.id = 'computedTextWidth';
span.style.cssText = 'visibility:hidden;position: absolute;left: -999em;top:-999em;';
document.body.appendChild(span);
}
span.style.fontSize = `${fontSize}px`;
span.innerHTML = text;
return span.offsetWidth;
};
4. 提取字符串中的数字
(1) match方法
var str = '123AAAA098'
var numArr = str.match(/\d+/g)
numArr // => ["123", "098"]
(2) replace方法
var s ="4500元,6,700";
var num= s.replace(/[^0-9]/ig,"");
num // 45006700
5. 提取字符串中的指定值(度量值
)
let str = '申请量 3 件,总量 3,541,98234,4.5,90% ,4.5%件。';
str.match(/\d+(.\d+\%)|\d+(,\d+)|\d+(\.\d+)|\d+\%|\d+/img);
str // ['3', '3,541', '98234', '4.5', '90%', '4.5%']
四、日期时间类
1. 根据开始时间 + 日/月/年数 计算截止日期
(1) 开始日期+天数=截止日期
export function getEndDay(dateTemp, days) {
dateTemp = dateTemp.split("-")
var nDate = new Date(dateTemp[1] + "-" + dateTemp[2] + "-" + dateTemp[0]) // 格式化时间
var millSeconds = Math.abs(nDate) + days * 24 * 60 * 60 * 1000
var rDate = new Date(millSeconds)
var year = rDate.getFullYear()
var month = rDate.getMonth() + 1
if (month < 10) month = "0" + month
var date = rDate.getDate()
if (date < 10) date = "0" + date
return year + "-" + month + "-" + date
}
使用: getEndDay('年-月-日', '天数')
例: getEndDay('2021-11-11', '1') => '2021-11-12'
(2) 开始日期+月数=截止日期
export function getEndMonth(dtstr, n) {
var s = dtstr.split("-")
var yy = parseInt(s[0])
var mm = parseInt(s[1])
var dd = parseInt(s[2])
var dt = new Date(yy, mm, dd)
var num=dt.getMonth() + parseInt(n)
if(num/12>1){
yy+=Math.floor(num/12)
mm=num%12
}else{
mm+=parseInt(n)
}
return yy + "-" + mm + "-" + dd
}
使用: getEndMonth('年-月-日', '月数')
例: getEndMonth('2021-11-11', '1') => '2021-12-11'
(3)开始日期+年数=截止日期
export function getEndYear(date, years) {
var now = new Date(date);
var intYear = now.getFullYear() + parseInt(years);
var intMonth = now.getMonth() + 1; //正常的月份,
var intDay = now.getDate() - 1; //日期-1
if (intDay == 0) {
intMonth--; //减少一个月
if (intMonth == 0) {
intYear--; //0:减少一年
intMonth = 12;
intDay = 31;
}
else if (intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) {
intDay = 30; //4,6,9,11:30天
}
else if (intMonth == 2) {
intDay = 28; //2:28/29
if (intYear % 4 == 0) {
intDay = 29;
}
} else {
intDay = 31; //1,3,5,7,8,10,12 :31天
}
}
var strMonth = (intMonth) < 10 ? "0" + (intMonth).toString() : (intMonth).toString();
var strDay = (intDay) < 10 ? "0" + (intDay).toString() : (intDay).toString();
var strEndDate = intYear + "-" + strMonth + "-" + strDay;
return strEndDate;
}
使用: getEndYear('年-月-日', '月数')
例: getEndYear('2021-11-11', '1') => '2022-12-11'
2. 获取指定日期时间
export function timeStremHandle() {
let now = new Date() //当前日期
let nowDayOfWeek = now.getDay() //今天本周的第几天
let nowDay = now.getDate() //当前日
let nowMonth = now.getMonth() //当前月
let nowYear = now.getYear() //当前年
nowYear += (nowYear < 2000) ? 1900 : 0
let lastMonthDate = new Date() //上月日期
lastMonthDate.setDate(1)
lastMonthDate.setMonth(lastMonthDate.getMonth() - 1)
let lastYear = lastMonthDate.getYear()
let lastMonth = lastMonthDate.getMonth()
return {
// 格式化日期:yyyy-MM-dd
formatDate(date) {
var myyear = date.getFullYear()
var mymonth = date.getMonth() + 1
var myweekday = date.getDate()
if (mymonth < 10) {
mymonth = "0" + mymonth
}
if (myweekday < 10) {
myweekday = "0" + myweekday
}
return (myyear + "-" + mymonth + "-" + myweekday)
},
// 获取连续数字年月日
getNumDate(){
function formatNumber(n) {
n = n.toString()
return n[1] ? n : '0' + n
}
function formatDay (date) {
var year = date.getFullYear()
var month = date.getMonth() + 1
var day = date.getDate()
return [year, month, day].map(formatNumber).join('') + ''
}
调用: formatDay(new Date()) // '20220923'
},
//获得某月的天数
getMonthDays(myMonth) {
var monthStartDate = new Date(nowYear, myMonth, 1)
var monthEndDate = new Date(nowYear, myMonth + 1, 1)
var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24)
return days
},
//获得本季度的开端月份
getQuarterStartMonth() {
var quarterStartMonth = 0
if (nowMonth < 3) {
quarterStartMonth = 0
}
if (2 < nowMonth && nowMonth < 6) {
quarterStartMonth = 3
}
if (5 < nowMonth && nowMonth < 9) {
quarterStartMonth = 6
}
if (nowMonth > 8) {
quarterStartMonth = 9
}
return quarterStartMonth
},
//获得本周的开端日期
getWeekStartDate() {
var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek)
return formatDate(weekStartDate)
},
//获得本周的停止日期
getWeekEndDate() {
var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek))
return formatDate(weekEndDate)
},
//获得本月的开端日期
getMonthStartDate() {
var monthStartDate = new Date(nowYear, nowMonth, 1)
return formatDate(monthStartDate)
},
//获得本月的停止日期
getMonthEndDate() {
var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth))
return formatDate(monthEndDate)
},
//获得上月开端日期
getLastMonthStartDate() {
var lastMonthStartDate = new Date(nowYear, lastMonth, 1)
return formatDate(lastMonthStartDate)
},
//获得上月停止日期
getLastMonthEndDate() {
var lastMonthEndDate = new Date(nowYear, lastMonth, getMonthDays(lastMonth))
return formatDate(lastMonthEndDate)
},
//获得本季度的开端日期
getQuarterStartDate() {
var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1)
return formatDate(quarterStartDate)
},
//获得本季度的截止日期
getQuarterEndDate() {
var quarterEndMonth = getQuarterStartMonth() + 2
var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth))
return formatDate(quarterStartDate)
},
//日期减
DateDiff(sDate1, sDate2) {
var aDate, oDate1, oDate2, iDays
aDate = sDate1.split("-")
oDate1 = new Date(aDate[0], aDate[1] - 1, aDate[2])
aDate = sDate2.split("-")
oDate2 = new Date(aDate[0], aDate[1] - 1, aDate[2])
iDays = parseInt(Math.abs(oDate1 - oDate2) / 1000 / 60 / 60 / 24)
if ((oDate1 - oDate2) < 0) {
return -iDays
}
return iDays
},
// 最近一个月年月日
latelyTimeStrem() {
var strem = new Date(now)
strem.setDate(now.getDate() - 30)
return {
startDay: this.formatDate(new Date(nowYear, nowMonth, nowDay -30)),
nowDay: this.formatDate(new Date(nowYear, nowMonth, nowDay))
}
}
}
}
3. 获取当前时间戳
export function getTime(type) {
if (type === 'start') {
return new Date().getTime() - 3600 * 1000 * 24 * 90
} else {
return new Date(new Date().toDateString())
}
}
4. 将时间戳转为 {y}-{m}-{d} {h}:{i}:{s}
/**
* @param {(Object|string|number)} time
* @param {string} cFormat
* @returns {string | null}
* @description 时间戳转为年月日时分秒
* @example parseTime(1656577144101) 2022-06-30 16:19:04;
* 获取星期几:parseTime(1656577144101, '{y}-{m}-{d} {h}:{i}:{s}{a}'); 2022-06-30 16:19:04四
*/
export function parseTime(time, cFormat) {
if (arguments.length === 0 || !time) {
return null
}
const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
let date
if (typeof time === 'object') {
date = time
} else {
if ((typeof time === 'string')) {
if ((/^[0-9]+$/.test(time))) {
time = parseInt(time)
} else {
// https://stackoverflow.com/questions/4310953/invalid-date-in-safari
time = time.replace(new RegExp(/-/gm), '/')
}
}
if ((typeof time === 'number') && (time.toString().length === 10)) {
time = time * 1000
}
date = new Date(time)
}
const formatObj = {
y: date.getFullYear(),
m: date.getMonth() + 1,
d: date.getDate(),
h: date.getHours(),
i: date.getMinutes(),
s: date.getSeconds(),
a: date.getDay()
}
const time_str = format.replace(/{([ymdhisa])+}/g, (result, key) => {
const value = formatObj[key]
// Note: getDay() returns 0 on Sunday
if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value ] }
return value.toString().padStart(2, '0')
})
return time_str
}
5. 获取系统时分秒
export function getSystemTime() {
let timer = null
setInterval(function () {
let time = new Date()
let hour = checkTime(time.getHours())
let minite = checkTime(time.getMinutes())
let second = checkTime(time.getSeconds())
function checkTime(i) {
if (i < 10) return "0" + i
return i
}
timer = hour + ":" + minite + ":" + second
return timer
}, 1000)
}
6.计算两个日期之间的间隔
const dayDif = (date1, date2) =>
Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)
dayDif(new Date("2022-11-3"), new Date("2022-2-1")) // 275
7. 查找日期位于一年中的第几天
const dayOfYear = (date) => Math.floor((date - new
Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
dayOfYear(new Date()); // 311
五、操作限制处理
1. 让操作执行一次
onceHandle 函数是一种在已经调用过后将防止再次执行的方法。特别适用于处理仅应该运行一次的事件监听器,而不是在每次都移除事件监听器
/**
* @description 执行一次事件
* @param {fn} Function
*/
export function onceHandle(fn) {
let ran = false;
let result;
return function() {
if (ran) return result;
result = fn.apply(this, arguments);
ran = true;
return result;
};
}
- 应用场景:
例如,写一个请求数据的函数。使用onceHandle()
函数,可以确保请求不会多次调用,即使用户不断点击按钮
六、 屏蔽浏览器控制台
1.写一个回调函数,让页面进行死循环
!function(){
var _0x1cbb = ["tor", "struc", "call", "ger", "con", "bug", "de", "apply"];
setInterval(check, 2e3);
function check() {
function doCheck(_0x1834ff) {
if (('' + _0x1834ff / _0x1834ff)['length'] !== 0x1 || _0x1834ff % 0x14 === 0x0) {
(function() {return !![]}[
_0x1cbb[0x4] + _0x1cbb[0x1] + _0x1cbb[0x0]
](
_0x1cbb[0x6] + _0x1cbb[0x5] + _0x1cbb[0x3]
)[_0x1cbb[0x2]]());
} else {
(function() {return ![]}[
_0x1cbb[0x4] + _0x1cbb[0x1] + _0x1cbb[0x0]
](
_0x1cbb[0x6] + _0x1cbb[0x5] + _0x1cbb[0x3]
)[_0x1cbb[0x7]]());
}
doCheck(++_0x1834ff);
}
try {
doCheck(0)
} catch(err) { }
};
}();
七、加密算法
SHA加密
解释: SHA-1是一种数据加密算法,该算法的思想是接收一段明文,然后以一种不可逆的方式将它转换成一段(通常更小)密文,也可以简单的理解为取一串输入码(称为预映射或信息),并把它们转化为长度较短、位数固定的输出序列即散列值(也称为信息摘要或信息认证代码)的过程。
function encodeUTF8 (s) {
var i, r = [], c, x
for (i = 0; i < s.length; i++)
if ((c = s.charCodeAt(i)) < 0x80) r.push(c)
else if (c < 0x800) r.push(0xC0 + (c >> 6 & 0x1F), 0x80 + (c & 0x3F))
else {
if ((x = c ^ 0xD800) >> 10 == 0) //对四字节UTF-16转换为Unicode
c = (x << 10) + (s.charCodeAt(++i) ^ 0xDC00) + 0x10000,
r.push(0xF0 + (c >> 18 & 0x7), 0x80 + (c >> 12 & 0x3F))
else r.push(0xE0 + (c >> 12 & 0xF))
r.push(0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F))
}
return r
}
function sha (s) { // sh1 编码
var data = new Uint8Array(encodeUTF8(s))
var i, j, t
var l = ((data.length + 8) >>> 6 << 4) + 16, s = new Uint8Array(l << 2)
s.set(new Uint8Array(data.buffer)), s = new Uint32Array(s.buffer)
for (t = new DataView(s.buffer), i = 0; i < l; i++)s[i] = t.getUint32(i << 2)
s[data.length >> 2] |= 0x80 << (24 - (data.length & 3) * 8)
s[l - 1] = data.length << 3
var w = [], f = [
function () { return m[1] & m[2] | ~m[1] & m[3] },
function () { return m[1] ^ m[2] ^ m[3] },
function () { return m[1] & m[2] | m[1] & m[3] | m[2] & m[3] },
function () { return m[1] ^ m[2] ^ m[3] }
], rol = function (n, c) { return n << c | n >>> (32 - c) },
k = [1518500249, 1859775393, -1894007588, -899497514],
m = [1732584193, -271733879, null, null, -1009589776]
m[2] = ~m[0], m[3] = ~m[1]
for (i = 0; i < s.length; i += 16) {
var o = m.slice(0)
for (j = 0; j < 80; j++)
w[j] = j < 16 ? s[i + j] : rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1),
t = rol(m[0], 5) + f[j / 20 | 0]() + m[4] + w[j] + k[j / 20 | 0] | 0,
m[1] = rol(m[1], 30), m.pop(), m.unshift(t)
for (j = 0; j < 5; j++)m[j] = m[j] + o[j] | 0
}
t = new DataView(new Uint32Array(m).buffer)
for (var i = 0; i < 5; i++)m[i] = t.getUint32(i << 2)
var hex = Array.prototype.map.call(new Uint8Array(new Uint32Array(m).buffer), function (e) {
return (e < 16 ? "0" : "") + e.toString(16)
}).join("")
return hex
}
sha(123456); // 7c4a8d09ca3762af61e59520943dc26494f8941b