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JS数组�Ҏ(gu��)��汇�?array数组元素的添加和删除

siyn — Mon, 25 May 2015 02:49:00 GMT

js数组元素相关�Ҏ(gu��)��

var arr = new Array();

arr[0] = "aaa";

arr[1] = "bbb";

arr[2] = "ccc";

//alert(arr.length);//3

arr.pop();

//alert(arr.length);//2

//alert(arr[arr.length-1]);//bbb

arr.pop();

//alert(arr[arr.length-1]);//aaa

//alert(arr.length);//1

var arr2 = new Array();

//alert(arr2.length);//0

arr2[0] = "aaa";

arr2[1] = "bbb";

//alert(arr2.length);//2

arr2.pop();

//alert(arr2.length);//1

arr2 = arr2.slice(0,arr2.length-1);

//alert(arr2.length);//0

arr2[0] = "aaa";

arr2[1] = "bbb";

arr2[2] = "ccc";

arr2 = arr2.slice(0,1);

alert(arr2.length);//1

alert(arr2[0]);//aaa

alert(arr2[1]);//undefined

shift�Q�删除原数组�W�一��，�q�返回删除元素的��|��如果数组为空则返回undefined

var a = [1,2,3,4,5];

var b = a.shift(); //a�Q�[2,3,4,5] b�Q?

unshift�Q�将参数��d��到原数组开��_��q�返回数�l�的长度

var a = [1,2,3,4,5];

var b = a.unshift(-2,-1); //a�Q�[-2,-1,1,2,3,4,5] b�Q?

注：在IE6.0下测试返回值��Mؓundefined�Q�FF2.0下测试返回��gؓ7�Q�所以这个方法的�q�回��g��可靠�Q�需要用�q�回值时可用splice代替本方法来使用�?nbsp;

pop�Q�删除原数组最后一��，�q�返回删除元素的��|��如果数组为空则返回undefined

var a = [1,2,3,4,5];

var b = a.pop(); //a�Q�[1,2,3,4] b�Q? //不用�q�回的话直接调用��可以了

push�Q�将参数��d��到原数组末尾�Q��ƈ�q�回数组的长�?nbsp;

var a = [1,2,3,4,5];

var b = a.push(6,7); //a�Q�[1,2,3,4,5,6,7] b�Q?

concat�Q�返回一个新数组�Q�是��参数添加到原数�l�中构成�?nbsp;

var a = [1,2,3,4,5];

var b = a.concat(6,7); //a�Q�[1,2,3,4,5] b�Q�[1,2,3,4,5,6,7]

splice(start,deleteCount,val1,val2,...)�Q�从start位置开始删除deleteCount��，�q�从该位�|��v插入val1,val2,...

var a = [1,2,3,4,5];

var b = a.splice(2,2,7,8,9); //a�Q�[1,2,7,8,9,5] b�Q�[3,4]

var b = a.splice(0,1); //同shift

a.splice(0,0,-2,-1); var b = a.length; //同unshift

var b = a.splice(a.length-1,1); //同pop

a.splice(a.length,0,6,7); var b = a.length; //同push

reverse�Q�将数组反序

var a = [1,2,3,4,5];

var b = a.reverse(); //a�Q�[5,4,3,2,1] b�Q�[5,4,3,2,1]

sort(orderfunction)�Q�按指定的参数对数组�q�行排序

var a = [1,2,3,4,5];

var b = a.sort(); //a�Q�[1,2,3,4,5] b�Q�[1,2,3,4,5]

slice(start,end)�Q�返回从原数�l�中指定开始下标到�l�束下标之间的项�l�成的新数组

var a = [1,2,3,4,5];

var b = a.slice(2,5); //a�Q�[1,2,3,4,5] b�Q�[3,4,5]

join(separator)�Q�将数组的元素组起一个字�W�串�Q�以separator为分隔符�Q�省略的话则用默认用逗号为分隔符

var a = [1,2,3,4,5];

var b = a.join("|"); //a�Q�[1,2,3,4,5] b�Q?1|2|3|4|5"

siyn 2015-05-25 10:49 发表评论

js 获取url参数

siyn — Fri, 09 Jan 2009 10:41:00 GMT

function getUrlParam(name)
{
    var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
    //alert(reg);
    var r = window.location.search.substr(1).match(reg);
    if(r!=null) return unescape(r[2]);
    return   null;
}

siyn 2009-01-09 18:41 发表评论

JS中，执行字符串的函数

siyn — Fri, 08 Aug 2008 06:44:00 GMT

JS中，执行字符串的函数老是忘，写这里了�?br /> eval(s);

siyn 2008-08-08 14:44 发表评论

EXT2.0学习--HelloWorld

siyn — Mon, 18 Feb 2008 06:54:00 GMT

学习了一�D�|��间EXT,觉得EXT太神奇了,今天奉上HelloWorld
主要步骤如下:
1.下蝲EXT,可以到其官方�|�站下蝲最新版�?http://extjs.com/
�q�里提供EXT2.0的最��必要部分下�?EXT.rar.
2.��下载的EXT攑ֈ��目�?�~�写HelloWorld.html,代码如下:

3.我们的HelloWorld,OK

siyn 2008-02-18 14:54 发表评论

parseFloat parseInt

siyn — Fri, 01 Feb 2008 10:42:00 GMT

parseInt(string,10)

��字�W�串转换为数�?
string待�{换的字符�?br /> 10表示十进�?可�?
当不填进制参数是,默认是十�q�制,
但当在前面有"0"�Ӟ��javascript的debugger会认��是一个八�q�制敎ͼ�
如parseInt("09")�q�回值将�?应�ؓ"09"不是一个合法的八进制数

parseFloat(string)

��字�W�串转换为��Q�Ҏ(gu��)��,
string待�{换的字符�?br /> 控制�_�ֺ��?toFixed(3)
3为精�?

siyn 2008-02-01 18:42 发表评论

siyn — Thu, 20 Dec 2007 09:04:00 GMT

js��单实现定时监��?
monitoringTower.js

function moniter(obj)
{
    Refresh(obj);
    var MyInterval=setInterval("Refresh("+obj+")",1000);
}

function Refresh(obj)
{
    divObj = $(obj);
        var newDateObj = new Date();
    divObj.innerHTML = newDateObj.toLocaleString();//旉��

}

test.html

<html>
  <head>
    <title>HTML Titletitle>
    <SCRIPT LANGUAGE="Javascript" SRC="prototype.js">SCRIPT>
    <SCRIPT LANGUAGE="Javascript" SRC="monitoringTower.js">SCRIPT>
  head>
  <BODY onload="moniter('test')">
    <div id="test">div>
  BODY>
html>

siyn 2007-12-20 17:04 发表评论