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//=============================================数学计算 Start=============================================
//加法函数
function FloatAdd(arg1, arg2) {
var r1, r2, m;
try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }
try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }
m = Math.pow(10, Math.max(r1, r2))
return (arg1 * m + arg2 * m) / m
}
//减法函数
function FloatSub(arg1, arg2) {
var r1, r2, m, n;
try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }
try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }
m = Math.pow(10, Math.max(r1, r2));
n = (r1 >= r2) ? r1 : r2;
return ((arg1 * m - arg2 * m) / m).toFixed(n);
}
//乘法函数
function FloatMul(arg1, arg2) {
var m = 0, s1 = arg1.toString(), s2 = arg2.toString();
try { m += s1.split(".")[1].length } catch (e) { }
try { m += s2.split(".")[1].length } catch (e) { }
return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m)
}
//除法函数
function accDiv(arg1, arg2) {
var t1 = 0, t2 = 0, r1, r2;
try { t1 = arg1.toString().split(".")[1].length; } catch (e) { }
try { t2 = arg2.toString().split(".")[1].length; } catch (e) { }
with (Math) {
r1 = Number(arg1.toString().replace(".", ""));
r2 = Number(arg2.toString().replace(".", ""));
return (r1 / r2) * pow(10, t2 - t1);
}
}
/*
* 将数值四舍五入(保留2位小数)后格式化成金额形式
*
* @param num 数值(Number或者String)
* @return 金额格式的字符串,如'1,234,567.45'
* @type String
*/
function formatCurrency(num) {
num = num.toString().replace(/\$|\,/g, '');
if (isNaN(num))
num = "0"; //不是数字让它为0
sign = (num == (num = Math.abs(num)));
num = Math.floor(num * 100 + 0.50000000001);
cents = num % 100;
num = Math.floor(num / 100).toString();
if (cents < 10)
cents = "0" + cents;
for (var i = 0; i < Math.floor((num.length - (1 + i)) / 3); i++)
num = num.substring(0, num.length - (4 * i + 3)) + ',' +
num.substring(num.length - (4 * i + 3));
return (((sign) ? '' : '-') + num + '.' + cents);
}
//四舍五入
function FormatNumber(srcStr, nAfterDot) {
var srcStr, nAfterDot;
var resultStr, nTen;
srcStr = "" + srcStr + "";
strLen = srcStr.length;
dotPos = srcStr.indexOf(".", 0);
if (dotPos == -1) {
resultStr = srcStr + ".";
for (var nIndex = 0; nIndex < nAfterDot; nIndex++) { resultStr = resultStr + "0"; }
} else {
if ((strLen - dotPos - 1) >= nAfterDot) {
nAfter = dotPos + nAfterDot + 1;
nTen = 1;
for (var nIndex = 0; nIndex < nAfterDot; nIndex++) { nTen = nTen * 10; }
resultStr = Math.round(parseFloat(srcStr) * nTen) / nTen;
} else {
resultStr = srcStr;
for (var nIndex = 0; nIndex < (nAfterDot - strLen + dotPos + 1); nIndex++) { resultStr = resultStr + "0"; }
}
}
return resultStr;
}
//=============================================数学计算 End=============================================
2.删除添加都很简单,用jq+ajax即可,对应页面用remove和append
3.cookies操作,js的cookies大把的,自己找下
4.你这么去计算,这个你需要找到单价和数量,完全jq筛选标签,获取内容得到,我喜欢用attr来获取,当然有人会用隐藏控件存储,个人觉得太烦了
具体的看http://www.school51.com/Sell/shoppingcart.aspx的页面源代码,现成的,不明白的M我邮件