简单的字符串操作 "4,5,6" 删除某个数字

Question

function delNum(str,n){
 str=str.replace(n+",","")
 str=str.replace(","+n,"")
}

Answer 1

myvicy兄弟，恐怕有些问题，可能把15,也删掉了

Answer 2

<script language=javascript>
str="4,5,6,15,7"
var num=5
str=str.replace(","+num+",",",")
str=str.replace(new RegExp("^"+num+","),"")
str=str.replace(new RegExp(","+num+"$"),"")
alert(str)
</script>

Answer 3

str="4,5,6,15,7";
str=","+str+",";
str=str.replace(new RegExp(","+num+",","g") , ",");
str=str.substring(1,str.length-1);
alert(str);