答案：1 <!DOCTYPE html>2 <html>3 <head>4 <meta charset="UTF-8">5 <title>加油优惠价格计算</title>6 </head>7 <body>8 <script type="text/javascript">9 var number = prompt("请输入汽油编号");10 var liters = prompt("请输入你要加多少升");11 if(number == "92"){12 if(liters >= 20){13 document.write('汽油5.9元一升;'+ '<br/>' +'共计:'+ (5.9*liters)+'元');14 }15 else {16 document.write('汽油6元一升;'+ '<br/>' +'共计:'+ (6*liters)+'元');17 }18 }19 else if(number == "97") {20 if(liters >= 40) {21 document.write('汽油6.5元一升;'+ '<br/>' +'共计:'+ (6.5*liters)+'元');22 }23 else {24 document.write('汽油7元一升;'+ '<br/>' +'共计:'+ (7*liters)+'元');25 }26 }27 else {28 alert("您输入的汽油我没见过");29 }30 </script>31 </body>32 </html>
