How to get the value in the select tag and modify it in js_javascript skills

The following partial code:

Copy the code The code is as follows:

< ;select name=”company_id” id=”company_id”>
BBB
AAA
CCC

Question: How about js Change BBB in the select tag to XXX, and change the value of valued in BBB to F?
The correct code is as follows:

Copy code The code is as follows:

function cheng()
{
var mylist=document.getElementById(“company_id”);
mylist.options[0].text =”XXX”;
}

Copy code The code is as follows:

//Modify the text of value="paraValue" in the select option to "paraText"
function jsUpdateItemToSelect(objSelect,objItemText,objItemValue)
{
//Judge whether it exists
if(jsSelectIsExitItem(objSelect,objItemValue))
{
for(var i=0;i< ;objSelect.options.length;i )
{
if(objSelect.options[i].value == objItemValue)
{
objSelect.options[i].text = objItemText;
break;
}
}
alert("Successfully modified");
}
else
{
alert("This item does not exist in the selection");
}
}