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<title>计算1！+2！+3！+4！+5！的和</title>
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document.write("计算1！+2！+3！+4！+5！的和<br/>");
for (i=1,sum=0;i<=5 ;i++ )
{
for (j=1,cj=1;j<=i ;j++ )
{
cj=cj*j;
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document.write(i+"!="+cj+"<br/>");
sum=sum+cj;
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document.write("1！+2！+3！+4！+5！="+sum);
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