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常用JS加密编码算法代码第1,javascript常用函数归

本文整理汇总了某些js常用函数,当中囊括对数据操作,字符替换操作,日期及加解密操作函数,还也可以有部分轻巧的辨证函数。便于我们查阅参谋。相信对大家会有着协理。

javascript常用函数归纳整理,javascript函数总结

本文整理汇总了部分js常用函数,在那之中囊括对数码操作,字符替换操作,日期及加解密操作函数,还会有一部分差没多少的辨证函数。便于我们查阅参谋。相信对大家会有着扶助。

1.typeof、constructor、instanceof对数组的论断

复制代码 代码如下:

var arr = [1,5,6,9,8,5,4];
//var arr = new Array(1,5,6,9,8,5,4);
console.log(typeof arr);//object
console.log(arr.constructor());//[]
console.log(arr instanceof Array);//true

2.函数自调用

复制代码 代码如下:

(function (a, b) {
    console.log(a b);//30 自调用
})(10, 20);3.去除两侧空格
function trim (str) {
    return str.replace(/^s |s $/g, '');
}
console.log('   woshi   sss   ');//   woshi   sss  
console.log(trim('   woshi   sss   '));//woshi   sss

4.数字决断

复制代码 代码如下:

function isNumber(n){
    return !isNaN(parseFloat(n)) && isFinite(n);
}
console.log(isNumber('e345'));

5.数组判定

复制代码 代码如下:

function isArray(obj){
    return Object.prototype.toString.call(obj) === '[object Array]澳门皇冠844网站,' ;
}
console.log(isArray(arr));

6.length的理解

复制代码 代码如下:

var myArray = [12 , 222 , 1000 ];
myArray.length = 0; // myArray 会产生空数组[].----- length是可读可写的属性

7、base64_encode加密,解密

复制代码 代码如下:

function base64encode(str){
    var out,i,len,base64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 /";
    var c1,c2,c3;
    len=str.length;
    i=0;
    out="";
    while(i<len){
        c1=str.charCodeAt(i )&0xff;
        if(i==len){
            out =base64EncodeChars.charAt(c1>>2);
            out =base64EncodeChars.charAt((c1&0x3)<<4);
            out ="==";
            break;
        }
        c2=str.charCodeAt(i );
        if(i==len){
            out =base64EncodeChars.charAt(c1>>2);
            out =base64EncodeChars.charAt(((c1&0x3)<<4)|((c2&0xF0)>>4));
            out =base64EncodeChars.charAt((c2&0xF)<<2);
            out ="=";
            break;
        }
        c3=str.charCodeAt(i );
        out =base64EncodeChars.charAt(c1>>2);
        out =base64EncodeChars.charAt(((c1&0x3)<<4)|((c2&0xF0)>>4));
        out =base64EncodeChars.charAt(((c2&0xF)<<2)|((c3&0xC0)>>6));
        out =base64EncodeChars.charAt(c3&0x3F);
    }
    return out;
}
function base64decode(str){
    var c1,c2,c3,c4,base64DecodeChars=new Array(-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1);
    var i,len,out;
    len=str.length;
    i=0;
    out="";
    while(i<len){
        /* c1 */
        do{
            c1=base64DecodeChars[str.charCodeAt(i )&0xff];
        }while(i<len&&c1==-1);
        if(c1==-1) break;
        /* c2 */
        do{
            c2=base64DecodeChars[str.charCodeAt(i )&0xff];
        }while(i<len&&c2==-1);
        if(c2==-1) break;
        out =String.fromCharCode((c1<<2)|((c2&0x30)>>4));
        /* c3 */
        do{
            c3=str.charCodeAt(i )&0xff;
            if(c3==61) return out;
            c3=base64DecodeChars[c3];
        }while(i<len&&c3==-1);
        if(c3==-1) break;
        out =String.fromCharCode(((c2&0XF)<<4)|((c3&0x3C)>>2));
        /* c4 */
        do{
            c4=str.charCodeAt(i )&0xff;
            if(c4==61) return out;
            c4=base64DecodeChars[c4];
        }while(i<len&&c4==-1);
        if(c4==-1) break;
        out =String.fromCharCode(((c3&0x03)<<6)|c4);
    }
    return out;
}
function utf16to8(str){
    var out,i,len,c;
    out="";
    len=str.length;
    for (i=0;i<len;i ){
        c=str.charCodeAt(i);
        if((c>=0x0001)&&(c<=0x007F)){
            out =str.charAt(i);
        } else if(c>0x07FF){
            out =String.fromCharCode(0xE0|((c>>12)&0x0F));
            out =String.fromCharCode(0x80|((c>>6)&0x3F));
澳门皇冠金沙网站,            out =String.fromCharCode(0x80|((c>>0)&0x3F));
        } else {
            out =String.fromCharCode(0xC0|((c>>6)&0x1F));
            out =String.fromCharCode(0x80|((c>>0)&0x3F));
        }
    }
    return out;
}
function utf8to16(str){
    var out,i,len,c;
    var char2,char3;
    out="";
    len=str.length;
    i=0;
    while(i<len){
        c=str.charCodeAt(i );
        switch (c>>4){
        case 0:
        case 1:
        case 2:
        case 3:
        case 4:
        case 5:
        case 6:
        case 7:
            // 0xxxxxxx
            out =str.charAt(i-1);
            break;
        case 12:
        case 13:
            // 110x xxxx   10xx xxxx
            char2=str.charCodeAt(i );
            out =String.fromCharCode(((c&0x1F)<<6)|(char2&0x3F));
            break;
        case 14:
            // 1110 xxxx  10xx xxxx  10xx xxxx
            char2=str.charCodeAt(i );
            char3=str.charCodeAt(i );
            out =String.fromCharCode(((c&0x0F)<<12)|((char2&0x3F)<<6)|((char3&0x3F)<<0));
            break;
        }
    }
    return out;
}

8、日期时间
getDay函数:重临星期几,值为0~6,当中0表示周日,1表示星期五,...,6表示星期天。例:

复制代码 代码如下:

function DateDemo() 

var d, day, x, s = "Today is: "; 
var x = new Array("Sunday", "Monday", "Tuesday"); 
var x = x.concat("Wednesday","Thursday", "Friday"); 
var x = x.concat("Saturday"); 
d = new Date(); 
day = d.getDay(); 
return(s = x[day]); 
}

(3)getHouse函数:重回日期的"小时"部分,值为0~23。例。

复制代码 代码如下:

function TimeDemo() 

var d, s = "The current local time is: "; 
var c = ":"; 
d = new Date(); 
s = d.getHours() c; 
s = d.getMinutes() c; 
s = d.getSeconds() c; 
s = d.getMilliseconds(); 
return(s); 
}

 
(4)getMinutes函数:重返日期的"分钟"部分,值为0~59。见上例。 
(5)getMonth函数:再次回到日期的"月"部分,值为0~11。在那之中0表示7月,2意味7月,...,11意味1月。见前方的事例。 
(6)getSeconds函数:重临日期的"秒"部分,值为0~59。见前方的例子。 
(7)getTime函数:再次回到系统时间。

意在本文所述对大家的javascript程序设计有所接济。

一:UTF8编码函数

1.typeof、constructor、instanceof对数组的推断

javascript的常用函数有什?

setInterval set提姆eout ,alert() , 等等 基本上自个儿定义函数function yourfunction(){函数体}  

复制代码 代码如下:

复制代码 代码如下:

javascript常用函数及措施

doc.51windows.net/...ir.htm  

本文整理汇总了有个别js常用函数,在那之中包罗对数码操作,字符替换操作,日期及加解密操作函...

function URLEncode(Str){
if(Str==null||Str=="")
return "";
var newStr="";
function toCase(sStr){
return sStr.toString(16).toUpperCase();
}
for(var i=0,icode,len=Str.length;i<len;i ){
icode=Str.charCodeAt(i);
if( icode<0x10)
newStr ="%0" icode.toString(16).toUpperCase();
else if(icode<0x80){
if(icode==0x20)
newStr =" ";
else if((icode>=0x30&&icode<=0x39)||(icode>=0x41&&icode<=0x5A)||(icode>=0x61&&icode<=0x7A))
newStr =Str.charAt(i);
else
newStr ="%" toCase(icode);
}
else if(icode<0x800){
newStr ="%" toCase(0xC0 (icode>>6));
newStr ="%" toCase(0x80 icode%0x40);
}
else{
newStr ="%" toCase(0xE0 (icode>>12));
newStr ="%" toCase(0x80 (icode>>6)%0x40);
newStr ="%" toCase(0x80 icode%0x40);
}
}
return newStr;
}

var arr = [1,5,6,9,8,5,4];
//var arr = new Array(1,5,6,9,8,5,4);
console.log(typeof arr);//object
console.log(arr.constructor());//[]
console.log(arr instanceof Array);//true

二:Base64编码,解码函数

2.函数自调用

复制代码 代码如下:

复制代码 代码如下:

var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 /";
var base64DecodeChars = new Array(
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
function base64encode(str) {
var out, i, len;
var c1, c2, c3;
len = str.length;
i = 0;
out = "";
while(i < len) {
c1 = str.charCodeAt(i ) & 0xff;
if(i == len)
{
out = base64EncodeChars.charAt(c1 >> 2);
out = base64EncodeChars.charAt((c1 & 0x3) << 4);
out = "==";
break;
}
c2 = str.charCodeAt(i );
if(i == len)
{
out = base64EncodeChars.charAt(c1 >> 2);
out = base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
out = base64EncodeChars.charAt((c2 & 0xF) << 2);
out = "=";
break;
}
c3 = str.charCodeAt(i );
out = base64EncodeChars.charAt(c1 >> 2);
out = base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
out = base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
out = base64EncodeChars.charAt(c3 & 0x3F);
}
return out;
}
function base64decode(str) {
var c1, c2, c3, c4;
var i, len, out;
len = str.length;
i = 0;
out = "";
while(i < len) {
/* c1 */
do {
c1 = base64DecodeChars[str.charCodeAt(i ) & 0xff];
} while(i < len && c1 == -1);
if(c1 == -1)
break;
/* c2 */
do {
c2 = base64DecodeChars[str.charCodeAt(i ) & 0xff];
} while(i < len && c2 == -1);
if(c2 == -1)
break;
out = String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
/* c3 */
do {
c3 = str.charCodeAt(i ) & 0xff;
if(c3 == 61)
return out;
c3 = base64DecodeChars[c3];
} while(i < len && c3 == -1);
if(c3 == -1)
break;
out = String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
/* c4 */
do {
c4 = str.charCodeAt(i ) & 0xff;
if(c4 == 61)
return out;
c4 = base64DecodeChars[c4];
} while(i < len && c4 == -1);
if(c4 == -1)
break;
out = String.fromCharCode(((c3 & 0x03) << 6) | c4);
}
return out;
}
function utf16to8(str) {
var out, i, len, c;
out = "";
len = str.length;
for(i = 0; i < len; i ) {
c = str.charCodeAt(i);
if ((c >= 0x0001) && (c <= 0x007F)) {
out = str.charAt(i);
} else if (c > 0x07FF) {
out = String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
out = String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
out = String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
} else {
out = String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
out = String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
}
}
return out;
}
function utf8to16(str) {
var out, i, len, c;
var char2, char3;
out = "";
len = str.length;
i = 0;
while(i < len) {
c = str.charCodeAt(i );
switch(c >> 4)
{
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
// 0xxxxxxx
out = str.charAt(i-1);
break;
case 12: case 13:
// 110x xxxx 10xx xxxx
char2 = str.charCodeAt(i );
out = String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
char2 = str.charCodeAt(i );
char3 = str.charCodeAt(i );
out = String.fromCharCode(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
}
}
return out;
}
function doit() {
var f = document.f
f.output.value = base64encode(utf16to8(f.source.value))
f.decode.value = utf8to16(base64decode(f.output.value))
}

(function (a, b) {
    console.log(a b);//30 自调用
})(10, 20);3.去除两边空格
function trim (str) {
    return str.replace(/^s |s $/g, '');
}
console.log('   woshi   sss   ');//   woshi   sss  
console.log(trim('   woshi   sss   '));//woshi   sss

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4.数字决断

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复制代码 代码如下:

function isNumber(n){
    return !isNaN(parseFloat(n)) && isFinite(n);
}
console.log(isNumber('e345'));

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