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                ``` 語法: if(條件1){ }else if(條件2){ }else if(條件3){ } ``` ``` <script type="text/javascript"> var shuru= parseFloat(prompt("輸入分數")); //輸入分數 if(shuru==0){ alert("沒法混了"); }else if(shuru<60){ alert("成績不及格"); } else if(shuru>=60&&shuru<70){ alert("成績剛剛及格"); } else if(shuru>=70&&shuru<80){ alert("成績還算不錯"); } else if(shuru>=80&&shuru<=100){ alert("成績很棒"); }else if(shuru>100){ alert("輸入的有誤重新輸入"); } </script> ```
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