body
{
font-family: "Microsoft YaHei UI","Microsoft YaHei",SimSun,"Segoe UI",Tahoma,Helvetica,Sans-Serif,"Microsoft YaHei", Georgia,Helvetica,Arial,sans-serif,宋体, PMingLiU,serif;
font-size: 10.5pt;
line-height: 1.5;
}
html, body
{
}
h1 {
font-size:1.5em;
font-weight:bold;
}
h2 {
font-size:1.4em;
font-weight:bold;
}
h3 {
font-size:1.3em;
font-weight:bold;
}
h4 {
font-size:1.2em;
font-weight:bold;
}
h5 {
font-size:1.1em;
font-weight:bold;
}
h6 {
font-size:1.0em;
font-weight:bold;
}
img {
border:0;
max-width: 100%;
}
blockquote {
margin-top:0px;
margin-bottom:0px;
}
table {
border-collapse:collapse;
border:1px solid #bbbbbb;
}
td {
border-collapse:collapse;
border:1px solid #bbbbbb;
}
js数组元素的添加和删除一直比较迷惑,今天终于找到详细说明的资料了,先给个我测试的代码^-^
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:删除原数组第一项,并返回删除元素的值;如果数组为空则返回undefined?
var a = [1,2,3,4,5];?
var b = a.shift(); //a:[2,3,4,5]?? b:1?
unshift:将参数添加到原数组开头,并返回数组的长度?
var a = [1,2,3,4,5];?
var b = a.unshift(-2,-1); //a:[-2,-1,1,2,3,4,5]?? b:7?
注:在IE6.0下测试返回值总为undefined,FF2.0下测试返回值为7,所以这个方法的返回值不可靠,需要用返回值时可用splice代替本方法来使用。?
pop:删除原数组最后一项,并返回删除元素的值;如果数组为空则返回undefined?
var a = [1,2,3,4,5];?
var b = a.pop(); //a:[1,2,3,4]?? b:5 //不用返回的话直接调用就可以了
push:将参数添加到原数组末尾,并返回数组的长度?
var a = [1,2,3,4,5];?
var b = a.push(6,7); //a:[1,2,3,4,5,6,7]?? b:7?
concat:返回一个新数组,是将参数添加到原数组中构成的?
var a = [1,2,3,4,5];?
var b = a.concat(6,7); //a:[1,2,3,4,5]?? b:[1,2,3,4,5,6,7]?
splice(start,deleteCount,val1,val2,...):从start位置开始删除deleteCount项,并从该位置起插入val1,val2,...?
var a = [1,2,3,4,5];?
var b = a.splice(2,2,7,8,9); //a:[1,2,7,8,9,5]?? b:[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:将数组反序?
var a = [1,2,3,4,5];?
var b = a.reverse(); //a:[5,4,3,2,1]?? b:[5,4,3,2,1]?
sort(orderfunction):按指定的参数对数组进行排序?
var a = [1,2,3,4,5];?
var b = a.sort(); //a:[1,2,3,4,5]?? b:[1,2,3,4,5]?
slice(start,end):返回从原数组中指定开始下标到结束下标之间的项组成的新数组?
var a = [1,2,3,4,5];?
var b = a.slice(2,5); //a:[1,2,3,4,5]?? b:[3,4,5]?
join(separator):将数组的元素组起一个字符串,以separator为分隔符,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:[1,2,3,4,5]?? b:"1|2|3|4|5"
再给个利用数组模拟javaStringBuffer处理字符串的方法:
/**
* 字符串处理函数
*/
function StringBuffer()
{
var arr = new Array;
this.append = function(str)
{
??? arr[arr.length] = str;?
};
this.toString = function()
{
??? return arr.join("");?//把append进来的数组ping成一个字符串
};
}
今天在应用中突然发现join是一种把数组转换成字符串的好方法,故封装成对象使用了:
/**
* 把数组转换成特定符号分割的字符串
*/
function arrayToString(arr,separator)
{
if(!separator) separator = "";//separator为null则默认为空
??? return arr.join(separator);?
}
/**
* 查找数组包含的字符串
*/
function arrayFindString(arr,string)
{
var str = arr.join("");?
??? return str.indexOf(string);?
}