js中获得网页源代码

??//alert(pos);? ??
1. ??var???fileName=url.substring(pos+1);???//从url中获得文件名?? ??
2. ??return???fileName;?? ??
3. ??}?? ??
4. ??? ??
5. ??function???onDownloadDone(fileName)?? ??
6. ??{?? ??
7. ??alert(fileName);???? ??
8. ??}???? ??
9. ??</script>?? ??
10. ??<input???type="button"???id="behaviorID"???style="behavior:url(#default#download)"??
11. ??
12. ??
13. 主要都是用到了behavior:url??