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];
});
}
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("");
}
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);
}
