怎么運行不出來，判斷分數。
? <script type="text/javascript">
? var score=80;
?if(score>=60&&score<=70){document.write("恭喜及格了")};
?else if(score>=80){document.write("優秀")};
?else{document.write("無")};
? </script>
慕粉1461748147
2016-05-15
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2016-05-15
<script type="text/javascript">
? var score=80;
?if(score>=60&&score<=70){document.write("恭喜及格了");}
?else if(score>=80){document.write("優秀");}
?else{document.write("無");}
? </script>
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