Onchange event implemented by js Code

The onchange event of select or text can be triggered only by Manually changing the value of select or text (input through the keyboard). If select or text is assigned to js, The onchang event cannot be triggered. For example, after the page is loaded, an onChange event needs to be triggered. In js, document. getElementById ("se "). value = "ttt"; it is not acceptable to assign values to select or text directly. to manually trigger the onchange event, add the following statement after js assigns values to select, (assume that the select id is sel) document. getElementById ("sel "). fireEvent ('onchange'), for example: 01