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- String.prototype.extract=function(start,end){
- var value=this;
- var rval="";
- for(var i=start; i<=end; i++){
- rval+=value.charAt(i)
- }
- ????? = rval;
- }
- var str="abcdef";
- str.extract(1,4)
- alert(str) //must be bcde
- String.prototype.extract=function(start,end, callback){
- var value=this;
- var rval="";
- for(var i=start; i<=end; i++){
- rval+=value.charAt(i)
- }
- callback(rval);
- }
- var str="abcdef";
- str.extract(1,4, function(s1) {
- alert(s1) //must be bcde
- });
- String.prototype.extract=function(start,end, callback){
- var value=this;
- var rval="";
- for(var i=start; i<=end; i++){
- rval+=value.charAt(i)
- }
- return rval;
- }
- var str="abcdef";
- str = str.extract(1,4);
- alert(str) //must be bcde
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