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| var day1=1; var day2=1; var sum=day1+day2; var day3=0; day3=day1+day2; sum=sum+day3;
var day1=day2; var day2=day3; day3=day1+day2; var sum =sum+day3;
var day1=day2; day2=day3; day3=day1+day2; sum+=day3;
var day1=1; var day2=1; var sum=day1+day2; var day3=day1+day2; var tar=parseInt(prompt("请输入斐波那契的月份信息(且月份大约三)")); for(i=3;i<tar;i++) {
day1=day2; day2=day3; day3=day1+day2; sum+=day3; } console.log(sum)
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