去掉重复字段问题？(小问题)

guodabao 2011-11-10 11:10:11

str="a,n,m";

当我向str字符中添加新的字符"b"
就会得到
str="a,n,m,b";

如果我向 str字符串中添加一个相同的字符 "m"
就不需要添加到 str字符串中
str="a,n,m,b";

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Mr-Jee 2011-11-10

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			var str = 'a,d,e,g,s,q,w';

			var dict = ['a','b','c','d','e','f','g','h','i','j'];

			

			

			function pushField(source, i) {

				if(source.indexOf(i) != -1) {

					return source;

				}

				return source + ',' + i;

			}

			

			for(var i = 0;i < dict.length;i++) {

				document.writeln('source:' + str + ',filed:' + dict[i] + ',result:'+pushField(str,dict[i]) + '<br />');

			}

licip 2011-11-10

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

 <head>

  <title> New Document </title>

  <meta name="Generator" content="EditPlus">

  <meta name="Author" content="">

  <meta name="Keywords" content="">

  <meta name="Description" content="">

 </head>



 <body>

  <script type="text/javascript">

  <!--

	var str="a,n,m";

	function addStr(str,s){

		if(str.indexOf(s)>=0){

		}else{

			str = str + "," + s;

		}



		return str;

	}



	str = addStr(str,'b');

	document.writeln("str:",str);

	str = addStr(str,'b');

	document.writeln("str:",str);

  //-->

  </script>

 </body>

</html>

默默不得鱼 2011-11-10

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window.onload=function(){

            alert(cc('a'));

        };

            var str="a,b,c";

            function cc(s){

                var ss=str.split(',');

                if(ss.indexOf(s)==-1){

                    ss.push(s);

                    str=ss.join(',');

                }

                return str;

            }