caculation feature add in website

I: data structure: I.I joined the volume property, expressed in litres, due to the incubator has a fixed size, must estimate whether the order and put it down one incubator. [login to view URL] products products Pro_Category property, type int. 0 is default, normal product 1 is a fresh product 2 frozen products II front office functions II.I When users choose the 1,2, add a header a Tips: "You have chosen our fresh frozen products, to provide you with professional incubator and overnight delivery for your shipments, please refer to here " Modifications in existing floating tip point. [login to view URL] C 1,2 products use different colors corresponding to fresh produce and frozen products title: 1, pale blue, 2 dark blue [login to view URL] D added to the subtotal a display to life fresh chilled transport of goods: If ordinary products to calculate shipping costs for X*0.8 total fresh frozen Y*1 we found the basis for calculating shipping costs. Examples: Only the common products: 340 g Spring wire 0.99 X10 Nissin instant noodle 0.99 X10 Shopping cart subtotal: 19.8 Add fresh and frozen products: 340 g Spring wire 0.99 X10 Nissin instant noodle 0.99 X10 Iced shrimp 10 X1 Cabbage 5 x 1 Values of chilled express 30.84* Shopping cart subtotal: 34.84 *19.8 x 0.8 + 10 x1 + 5x1 = 30.84 II.V Calculation of volume and weight, weight already exists in the [login to view URL] shipping rates are calculated in chilled products must meet the weight does not exceed 29kg and 45liter. III development of background It is worth rather than the background, but the mechanism and algorithm for calculating: Ordinary products 0 in all common Optional overnight delivery or DHL with product, calculated without [login to view URL] according to table rate [login to view URL] common DHL or overnight [login to view URL] of these tablerate can be exported in the background. Fresh chilled transport of goods to the afterlife: When ordinary products and fresh fight, because we use special incubators, and must limit the customer must select overnight delivery to ensure [login to view URL] time value is multiplied by a weighting of ordinary products, like 0.8 degree of profit in order to ensure that the [login to view URL] total value of fresh chilled transport of goods to the afterlife, and uses this value to calculate the shipping costs, instead of the actual calculation of the total [login to view URL] on the total value of fresh chilled transport of goods to the afterlife the cost of going to overnight delivery, for example, free shipping is 69 euro, in the case of chilled is generally greater than 69 euro, depending on how many generic products may be. Weight: General shipping weight (W0) weight * 1.1 Fresh product shipping weight (W1) weight*1.2 Chilled product shipping weight (W2) weight*1.5 Total weight W0+W1+W2 < 29kg and beyond, suggesting customers: "You buy the product has exceeded the weight of our packaging, please delete some merchandise and open another order to keep buying. ”When the list becomes 29kg the following calculation of the shipping cost back into a [login to view URL] alert customers now is a single package. Volume: General goods transport volume (V0) volume *1.0 Fresh produce transportation volume (V1) volume*1.2 Transport volume for chilled products (V2) volume*1.2 Total volume was V0+V1+V2 < 45liter 45liter prompts the customer "The volume of the commodity has gone beyond the package you buy, please delete some merchandise and open another order to keep buying. ”When the list becomes 45liter the following calculation of the shipping cost back into a package. III.I Plug-in preferences: Shipping weight parameter: Product: 0.75 Fresh produce: 0.9 Chilled products: 1 Shipping weight: Product W0:1.1 New products W1:1.2 Chilled products W2:1.5 Transport volume: Product V0:1.0 New products V1:1.2 Chilled products V2:1.2 Parcel size and weight: Wx：29 kg Vx：45Liter These parameters can be modified on a background plug-in.