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<html> <head> <meta charset="utf-8"> <title>計算1+2+3 ... +98+99+100的值</title> </head> <body> <script language="JavaScript" type="text/javascript"> var total=0; for(var i=1; ;i++){ if(i>100){ break; } total+=i; continue; alert(i); } alert(total); </script> </body> </html>