处理String

strReplace：

function strReplace(str:String, search:String, replace:String):String {
 return str.split(search).join(replace);
}

wordCount

function wordcount(string:String):Number {
    var tmp:Array = string.split(" ");
    for (var i = tmp.length; i>0; i--) {
        if (tmp[i] == "") {
            tmp.splice(i,1);
        }
    }
    return tmp.length;
}
trace(wordcount("An apple a day keeps the doctor away"));