Summary of jquery's method of removing duplicate strings_jquery
本文实例总结了jquery实现去除重复字符串的方法。分享给大家供大家参考，具体如下：
这里总结了三种去除重复字符串的方法：
把例子贴上，用jQuery方便些，首先要搭好环境，就是在同一目录下（同一文件夹下）保证有所使用的jquery1.8.1（如果是其他版本就在html代码中作相应改动）
第一：
<html>
<head>
<script src="jquery-1.8.1.js"></script>
<SCRIPT LANGUAGE="JavaScript">
$(function(){
$('#delRepeat').click(function(){
var str = $('#repeatValue').val();
var strArr=str.split("");//把字符串分割成一个数组
strArr.sort();//排序
var result=new Array();//创建出一个结果数组
var tempStr="";
for(var i in strArr)
{
if(strArr[i] != tempStr)
{
result.push(strArr[i]);
tempStr=strArr[i];
}
else
{
continue;
}
}
$('#noRepeat').val(result.join(""))//把数组连成字符串并展示到页面
})
})
</SCRIPT>
</head>
<body>
原值<input id="repeatValue" type="text" ><input id="delRepeat" type="button" value="去重">
<input type="text" id="noRepeat">
</body>
</html>
说明：通常就是把字符串分割成数组，再对数组操作，相对来说数组的方法多些，方便些，最后再join成字符串
关于sort()方法，之所以先对数组元素排序，就是因为可以把相同的字符归到一起，就不用再双层循环，要不然就得拿到每个元素，和剩余的逐个比对，这个sort会按照ASCII 字符顺序进行升序排列
第二：
<html>
<head>
<script src="jquery-1.8.1.js"></script>
<SCRIPT LANGUAGE="JavaScript">
$(function(){
$('#delRepeat').click(function(){
var str = $('#repeatValue').val();
var strArr=str.split("");
//排序
strArr.sort();
var result =$.unique(strArr);
$('#noRepeat').val(result.join(""));
})
})
</SCRIPT>
</head>
<body>
原值<input id="repeatValue" type="text" ><input id="delRepeat" type="button" value="去重">
<input type="text" id="noRepeat">
</body>
</html>
说明，这个unique方法确实方便，但有两个缺陷：
1、只对数组有效（直接字符串不行），并且该数组不能是数字数组,
2、只对相邻的重复元素有效，隔开的不行。
例如：[a,a,b,b,c,c]---unique----》[a,b,c]有效
[a,a,b,b,c,c,a]--unique-->[a,b,c,a]元素a仍然重复，无效
因此调用unique之前必须调用一下sort方法将其重复元素重排一下，挨在一起
但也因为调用了sort方法，顺序给重排了如：[b,b,c,c,a,a]---unique-->[a,b,c]不是[b,c,a]
第三：
<html>
<head>
<script src="jquery-1.8.1.js"></script>
<SCRIPT LANGUAGE="JavaScript">
$(function(){
$('#delRepeat').click(function(){
var str = $('#repeatValue').val();
var reg = /(.)(?=.*\1)/g;//预搜索方式（有的叫断言）
var result = str.replace(reg, "");
$('#noRepeat').val(result);
})
})
</SCRIPT>
</head>
<body>
原值<input id="repeatValue" type="text" value="aca" ><input id="delRepeat" type="button" value="去重">
<input type="text" id="noRepeat">
</body>
</html>
说明：
var reg =/(.)(?=.*\1)/g;
.匹配任意字符，但只能匹配任意字符中的一个
(.)加上()就是将匹配的该字符存储起来供以后引用
(?=)预搜索（也有叫断言的，也有叫预查的），指明某个字符的右侧是什么，但不包含这部分，只取这个‘某个字符'
如：p(?=ing) 匹配字符串ping时匹配成功，但匹配到的字符是p不是ping
(?=.*\1) 这个\1就是指的前面(.)的这个字符，之前说它被加上小括号就是被存储起来了，现在1就是取存储的第一个（共一个）
*匹配次数，也有人称之为量词，指出现任意次
.*指出现任意次任意字符
(.)(?=.*\1)指第一个匹配字符，如果右侧出现的内容中包含该字符时就匹配上该字符
g 指globle，全局匹配模式，匹配所有字符串
这个去重的结果其实是倒着来排序的，就是说重复字符出现在前面的都被置空了，是按一个字符从后往前出现的顺序排的
另：关于去重感兴趣的朋友还可以参考本站在线工具：
更多关于jQuery相关内容可查看本站专题：《jQuery操作xml技巧总结》、《jQuery拖拽特效与技巧总结》、《jQuery扩展技巧总结》、《jQuery常见经典特效汇总》、《jQuery动画与特效用法总结》、《jquery选择器用法总结》及《jQuery常用插件及用法总结》
希望本文所述对大家jQuery程序设计有所帮助。
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