代码如下： <SCRIPT LANGUAGE="JavaScript"> <!-- Begin var max_units = 200; // 最大值 var currency = "￥"; // 货币符号 function getDiscountPrice(units) { if (units >= max_units) return 4; if (units >= 100) return 6; if (units >= 50) return 8; if (units >= 25) return 10; if (units >= 10) return 13; if (units >= 5) return 16; if (units >= 2) return 17.50; if (units == 1) return 19.95; if (units <= 0) return 0; } function getNumberOfUnits() { var units = document.calculator.units.value; return (units == "") ? 0 : units; } function showResult(result) { // adjust the following line if result must popup somewhere else document.calculator.respons.value = result; } function formatMessage(units, unit_price) { return units + " * " + currency + formatPrice(unit_price) + " = " + currency + formatPrice(units * unit_price); } // AltUnits (alternate units): add extra units to reach minimum for next discount price function getAltUnits(units) { var discount_price = getDiscountPrice(units); if (units < max_units) do { units++ } while (discount_price == getDiscountPrice(units)); return units; } function findPrice() { var units = getNumberOfUnits(); var unit_price = getDiscountPrice(units); var alt_units = getAltUnits(units); var alt_unit_price = getDiscountPrice(alt_units); var result; if ((units * unit_price) < (alt_units * alt_unit_price)) result = formatMessage(units, unit_price); else result = formatMessage(alt_units, alt_unit_price); showResult(result); } function formatPrice(value) { var result= Math.floor(value) + "."; var cents = 100 * (value-Math.floor(value)) + 0.5; result += Math.floor(cents / 10); result += Math.floor(cents % 10); return result; } function filterNonNumeric(field) { var result = new String(); var numbers = "0123456789"; var chars = field.value.split(""); // create array for (i = 0; i < chars.length; i++) { if (numbers.indexOf(chars[i]) != -1) result += chars[i]; } if (field.value != result) field.value = result; } // End --> </script> <table border="1" cellspacing="0" cellpadding="3" width="300" align="center"> <tr> <td>单个数量单位的价格</td> <td width=50 align=right>￥19.95</td> </tr> <tr> <td>2-4个数量单位的价格</td> <td width=50 align=right> ￥17.50</td> </tr> <tr> <td>5-9个数量单位的价格</td> <td width=50 align=right>￥16.00</td> </tr> <tr> <td>10-24个数量单位的价格</td> <td width=50 align=right> ￥13.00</td> </tr> <tr> <td>25-49个数量单位的价格</td> <td width=50 align=right>￥10.00</td> </tr> <tr> <td>50-99个数量单位的价格</td> <td width=50 align=right> ￥8.00</td> </tr> <tr> <td>100-199个数量单位的价格</td> <td width=50 align=right> ￥6.00</td> </tr> <tr> <td>大于200个数量单位的价格</td> <td width=50 align=right> ￥4.00</td> </tr> </table> <br> <form name=calculator> <div align="center">只需输入数量即可: <input type=text value="1" name="units" onkeydown="findPrice()" onKeyUp="filterNonNumeric(this); findPrice()" onkeypress="findPrice()" size="4"> <input type=text onfocus="this.blur()" name="respons" size="24" style="border:0; font-weight:bold"> </div> </form> <body onLoad="findPrice()">
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