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function sm_1300()
{
var a,b,c;
a=1;b=2;
for(var i=1;i<=1300;i++)
{
document.write(a,"+",b,"=",a+b,"<br>");
c=b;
b=a+b;
a=c;
}
}
早说嘛:改为:
function sm_1300()
{
var a,b,c;
a=1;b=2;
for(;b<=1300;)
{
document.write(a,"+",b,"=",a+b,"<br>");
c=b;
b=a+b;
a=c;
}
}