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本文小编为大家详细介绍“JavaScript常用字符串与数组扩展函数有哪些”，内容详细，步骤清晰，细节处理妥当，希望这篇“JavaScript常用字符串与数组扩展函数有哪些”文章能帮助大家解决疑惑，下面跟着小编的思路慢慢深入，一起来学习新知识吧。
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String对象的扩展函数：
String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g,"");
}
String.prototype.ltrim = function() {
return this.replace(/^\s+/g,"");
}
String.prototype.rtrim = function() {
return this.replace(/\s+$/g,"");
}
String.prototype.splitAndTrim = function($delimiter, $limit)
{
var $ss = this.split($delimiter, $limit);
for(var $i=0; $i<$ss.length; $i++)
$ss[$i] = $ss[$i].trim();
return $ss;
}
String.prototype.htmlEntities = function () {
return this.replace(/&/g,'&').replace(//g,'>');
}
String.prototype.stripTags = function () {
return this.replace(/<([^>]+)>/g,'');
}
String.prototype.toArray = function() {
return this.split('');
}
String.prototype.toIntArray = function() {
var returnArray = [];
for (var i=0; i变量替换
var a = "I Love {0}, and You Love {1},Where are {0}!";a.format("You","Me");
String.prototype.format = function(){
var args = arguments;
return this.replace(/\{(\d+)\}/g,function(m,i,o,n){
return args[i];
});
}在字符串末尾追加字符串
String.prototype.append = function($str){
return this.concat($str);
}删除指定索引位置的字符，索引无效将不删除任何字符
String.prototype.deleteCharAt = function($sIndex){
if($sIndex<0 || $sIndex>=this.length){
return this.valueOf();
}else if($sIndex==0){
return this.substring(1,this.length);
}else if($sIndex==this.length-1){
return this.substring(0,this.length-1);
}else{
return this.substring(0,$sIndex)+this.substring($sIndex+1);
}
}删除指定索引间的字符串.$sIndex和$eIndex所在的字符不被删除！依赖deleteCharAt
String.prototype.deleteString = function($sIndex, $eIndex){
if($sIndex==$eIndex){
return this.deleteCharAt($sIndex);
}else{
if($sIndex>$eIndex){
var tIndex=$eIndex;
$eIndex=$sIndex;
$sIndex=tIndex;
}
if($sIndex<0)$sIndex=0;
if($eIndex>this.length-1)$eIndex=this.length-1;
return this.substring(0,$sIndex+1)+this.substring($eIndex,this.length);
}
}检查字符串是否以某个字符串(str)结尾
String.prototype.endsWith = function($str){
return this.substr(this.length - $str.length) == $str;
}检查该字符串是否以某个字符串开始
String.prototype.startsWith = function(str){
return this.substr(0, str.length) == str;
}比较两个字符串是否相等，不区分大小写!
String.prototype.equalsIgnoreCase = function($str){
if(this.length!=$str.length){
return false;
}else{
var tmp1=this.toLowerCase();
var tmp2=$str.toLowerCase();
return tmp1==tmp2;
}
}将指定的字符串插入到指定的位置后面!索引无效将直接追加到字符串的末尾
String.prototype.insert = function($ofset, $str){
if($ofset<0 || $ofset>=this.length-1){
return this.concat($str);
}
return this.substring(0,$ofset)+$str+this.substring($ofset+1);
}将指定的位置的字符设置为另外指定的字符或字符串.索引无效将直接返回不做任何处理！
String.prototype.setCharAt = function($ofset, $str){
if($ofset<0 || $ofset>=this.length-1){
return this.valueOf();
}
return this.substring(0,$ofset)+$str+this.substring($ofset+1);
}
String.prototype.replaceLen = function(start, len, replaced) {
if(!len)
return this;
if(start >= this.length)
return this;
var returnSeg = '';
var returnSeg2 = '';
var i = 0;
for (; i < this.length; i++){
var c = this.charAt(i);
if(i < start)
returnSeg += c;
if(i >= start + len)
returnSeg2 += c;
}
return returnSeg + replaced + returnSeg2;
}扩展基础类：
替换字符，这个在替换填入比较有用，比如***天***小时 替换为 天小时
String.prototype.replaceChar = function(target, replaced, start) {
if(!target)
return this;
if(!start)
start = 0;
var returnVal = this.substring(0, start);
var index = 0;
for (var i = start; i < this.length; i++) {
var c = this.charAt(i);
target = typeof target == 'function' ? target.call(this, index) : target;
if (c == target) {
returnVal += typeof replaced == 'function' ? replaced.call(this, index) : replaced;
while (i < this.length - 1 && this.charAt(i + 1) == c) {
i++;
}
index++;
}else{
returnVal += c;
}
}
return returnVal;
}将该字符串反序排列
String.prototype.reverse = function(){
var str="";
for(var i=this.length-1;i>=0;i--){
str=str.concat(this.charAt(i));
}
return str;
}计算长度，每个汉字占两个长度，英文字符每个占一个长度
String.prototype.ucLength = function(){
var len = 0;
for(var i=0;i255)len+=2;
else len++;
}
return len;
} 在字符串的左边填充一些特定的字符
String.prototype.lpad = function(len, s) {
var a = new Array(this);
var n = (len - this.length);
for ( var i = 0; i < n; i++) {
a.unshift(s);
}
return a.join("");
}在字符串的右边填充一些特定的字符
String.prototype.rpad = function(len, s) {
var a = new Array(this);
var n = (len - this.length);
for ( var i = 0; i < n; i++) {
a.push(s);
}
return a.join("");
}把字符串的首字母转化为大写
String.prototype.ucwords = function() {
return this.substring(0,1).toUpperCase().concat(this.substring(1));
}
String.prototype.contains = function($str) {
return this.indexOf($str) > -1 ? true : false;
}将格式为2008-04-02 10:08:44的字符串转成日期(String对象的值必须为: 2008-04-02 10:08:44)
String.prototype.toDate = function(){
var str = this.replace(/-/g,"/");
return (new Date(str));
}将原来用字符串表示的十进数转成十进制浮点数: precision为精度
String.prototype.toFloat = function(precision){
precision = precision || 2;
return parseFloat(this,10).toFixed(precision);
}将原来用字符串表示的十进数转成十进制整数
String.prototype.toInt = function(){
return parseInt(this,10).toString();
}将两个原来用字符串表示的十进数相加后当作字串返回 : addend为加数
String.prototype.add = function(addend){
var sum = parseFloat(this,10) + parseFloat(addend,10);
return sum+"";
}十进制转其他进制代码如下nextScale为进制 如2,8,16
String.prototype.shiftScale = function(nextScale){
return parseFloat(this).toString(nextScale);
}
各进制互相转换 ：
this对象必须是整数
@param preScale 原是是几进制数
@param nextScale 要转换成几进制数
String.prototype.scaleShift = function(preScale,nextScale){
return parseInt(this,preScale).toString(nextScale);
}全角2半角 document.write("ＡＢＣ １２３，我们都是好朋友");
String.prototype.dbc2sbc = function (){
return this.replace(/[\uff01-\uff5e]/g,function(a){return String.fromCharCode(a.charCodeAt(0)-65248);}).replace(/\u3000/g," ");
}
Array扩展函数：
var isNumeric = function(x) {
// returns true if x is numeric and false if it is not.
var RegExp = /^(-)?(\d*)(\.?)(\d*)$/;
return String(x).match(RegExp);
}
var myArray = [1,'two',3,'four',5,'six',7,'eight',9,'ten'];
var oddArray=myArray.filter(isNumeric); // outputs: 1,3,5,7,9
var oddArray=myArray.some(isNumeric); // outputs: true
var oddArray=myArray.every(isNumeric); // outputs: false
var printArray =function(x, idx){
document.writeln('['+idx+'] = '+x);
}
myArray.forEach(printArray);// outputs: [0] = 1 [1] = two [2] = 3 [3] = four [4] = 5
myArray.remove(9);
document.writeln(myArray);
if (!Array.prototype.every)
{
Array.prototype.every = function(fun /*, thisp*/)
{
var len = this.length;
if (typeof fun != "function")
throw new TypeError();
var thisp = arguments[1];
for (var i = 0; i < len; i++)
{
if (i in this &&
!fun.call(thisp, this[i], i, this))
return false;
}
return true;
};
}
if (!Array.prototype.filter)
{
Array.prototype.filter = function(fun /*, thisp*/)
{
var len = this.length;
if (typeof fun != "function")
throw new TypeError();
var res = new Array();
var thisp = arguments[1];
for (var i = 0; i < len; i++)
{
if (i in this)
{
var val = this[i]; // in case fun mutates this
if (fun.call(thisp, val, i, this))
res.push(val);
}
}
return res;
};
}
if (!Array.prototype.forEach)
{
Array.prototype.forEach = function(fun /*, thisp*/)
{
var len = this.length;
if (typeof fun != "function")
throw new TypeError();
var thisp = arguments[1];
for (var i = 0; i < len; i++)
{
if (i in this)
fun.call(thisp, this[i], i, this);
}
};
}
if (!Array.prototype.map)
{
Array.prototype.map = function(fun /*, thisp*/)
{
var len = this.length;
if (typeof fun != "function")
throw new TypeError();
var res = new Array(len);
var thisp = arguments[1];
for (var i = 0; i < len; i++)
{
if (i in this)
res[i] = fun.call(thisp, this[i], i, this);
}
return res;
};
}
if (!Array.prototype.some)
{
Array.prototype.some = function(fun /*, thisp*/)
{
var len = this.length;
if (typeof fun != "function")
throw new TypeError();
var thisp = arguments[1];
for (var i = 0; i < len; i++)
{
if (i in this &&
fun.call(thisp, this[i], i, this))
return true;
}
return false;
};
}
Array.prototype.sortNum = function() {
return this.sort( function (a,b) { return a-b; } );
}
Array.prototype.find = function(searchStr) {
var returnArray = false;
for (i=0; i随机改变数组的排序
Array.prototype.shuffle = function (){
for(var rnd, tmp, i=this.length; i; rnd=parseInt(Math.random()*i), tmp=this[--i], this[i]=this[rnd], this[rnd]=tmp);
return this;
}
Array.prototype.compare = function(testArr) {
if (this.length != testArr.length) return false;
for (var i = 0; i < testArr.length; i++) {
if (this[i].compare) {
if (!this[i].compare(testArr[i])) return false;
}
if (this[i] !== testArr[i]) return false;
}
return true;
}去掉数组中重复的值var a = new Array("5","7","7"); a.unique();
Array.prototype.unique = function() {
var data = this || [];
var a = {}; //声明一个对象，javascript的对象可以当哈希表用
for (var i = 0; i < data.length; i++) {
a[data[i]] = true; //设置标记，把数组的值当下标，这样就可以去掉重复的值
}
data.length = 0;
for (var i in a) { //遍历对象，把已标记的还原成数组
this[data.length] = i;
}
return data;
}
Array.prototype.addAll = function($array)
{
if($array == null || $array.length == 0)
return;
for(var $i=0; $i<$array.length; $i++)
this.push($array[$i]);
}
Array.prototype.contains = function($value)
{
for(var $i=0; $i= len)
from = len - 1;
}
for (; from > -1; from--)
{
if (from in this &&
this[from] === elt)
return from;
}
return -1;
};
}
Array.prototype.insertAt = function($value, $index)
{
if($index < 0)
this.unshift($value);
else if($index >= this.length)
this.push($value);
else
this.splice($index, 0, $value);
}
根据数组的下标来删除元素
Array.prototype.removeByIndex=function($n) {
if($n<0){ //如果n<0，则不进行任何操作。
return this;
}else{
return this.slice(0,$n).concat(this.slice($n+1,this.length));
}
}依赖indexOf
Array.prototype.remove = function($value)
{
var $index = this.indexOf($value);
if($index != -1)
this.splice($index, 1);
}
Array.prototype.removeAll = function()
{
while(this.length > 0)
this.pop();
}
Array.prototype.replace = function($oldValue, $newValue)
{
for(var $i=0; $ilen?len:start?start:0;
delLen=delLen<0?0:delLen>len?len:delLen?delLen:len;
var arr =[],res=[];
var iarr=0,ires=0,i=0;
for(i=0;i=delLen) arr[iarr++]=this[i];
else {
res[ires++]=this[i];
if(item&&ires==delLen){
arr[iarr++]=item;
}
}
}
if(item&&ires
分开添加,关键字shallow copy,如果遇到数组，复制数组中的元素
Array.prototype.concat = function(){
var i=0;
while(ilen?len:end?end:len;
var i=start;
var res = [];
while(i读到这里，这篇“JavaScript常用字符串与数组扩展函数有哪些”文章已经介绍完毕，想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会，如果想了解更多相关内容的文章，欢迎关注创新互联行业资讯频道。
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