dropdown

The 'dropdown' function displays a dropdown box allowing end-users to select an item from a given list;
'dropdown'函数提供下拉选项让用户选择

• Prototype: dropdown(sDescr, vEntries);
• Parameters:
  1. sDescr: a descriptive text;
     显示的文本
  2. vEntries, an Array containing items to be listed;
     包含可选项的列表
• Return Value: index of the selected item, 0-based; or -1 on cancel.
• Example:

  var iSel=dropdown('Select a color', ['red', 'green', 'blue', 'yellow']);