<script>
var score = Math.round(Math.random() * 100);
if(score < 60){
alert(score + '为不及格!')
}
else if(score >= 60 && score < 70){
alert(score + '为及格')
}
else if(score >= 70 && score < 80){
alert(score + '为良好')
}
else if(score >= 80 && score < 90){
alert(score + '为优秀')
}
else if(score >= 90){
alert(score + '为牛掰');
}
</script>
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