字符串的替换

Question

<script language="javascript">
var s= "123$xxx$$xxxX$456"
var s1= "123$xxx$333$xxxX$456"
alert(s.replace(/\$[^\$]*\$/g,"mm"))
alert(s1.replace(/\$[^\$]*\$/g,"mm"))
</script>

Answer 1

//函数
String.prototype.cReplace = function(str1,str2)
{
var re = new RegExp(["$","str1","$"].join(""),"ig");
return this.replace(re,str2);
}
//调用
s="123$abc$$cde$456";
alert(s.cReplace("abc","|"));
alert(s.cReplace("cde","$"));
s = s.cReplace("abc","|").cReplace("cde","$");
alert(s);

Answer 2

//函数
String.prototype.cReplace = function(str1,str2)
{
    var re = new RegExp(["\\$","str1","\\$"].join(""),"ig");
    return this.replace(re,str2);
}
//调用
s="123$abc$$cde$456";
alert(s.cReplace("abc","|"));
alert(s.cReplace("cde","$"));
s = s.cReplace("abc","|").cReplace("cde","$");
alert(s);

Answer 3

var arr = str.split("$");
var len = parseInt((arr.length-1)/2);
var text = "abc";
var index = 0;
var value = arr[index++];
for(var i=0;i<len;i++){
    var key = arr[index++];
    value+= text+arr[index++];
}

if(arr.length != index){
    value += "$" + arr[index];
}

return value;