The front-end management program of the shopping cart --- only interacts with the server once (2. javascript part)

Source: Internet
Author: User
Cart. js
Save it as cart. js and put it in the same directory as the previous html.
// File name: cart. js
// Description: Use the javascript function library at the front end of the shopping cart.
// Function list: On_Cancel (txtAmount, txtSum) ---- cancel this item
// On_Update () ---- update quantity
// On_Del () ---- delete all
// UpdateDate () ---- update form Display
// Round () ---- rounding the number of specified decimal places
// Aurthor: LiuYunpeng
// Date: 2000/09/03
// History: 2000/09/03 version 1.0
// ---------------- Code begin here ------------------------------------------
Function On_Cancel (txtAmount, txtSum)
TxtAmount. value = 0;
TxtSum. value = 0;
UpdateData ();
// Update the form Display
Function UpdateData ()
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