Methods and techniques for controlling the read-only or writable attributes of a text field using JS

The examples in this article describe the JS method of controlling the read-only or writable attributes of a text field. Share it with everyone for your reference, the details are as follows:

<input id="username" name="userneme" type="text" style="width:50px" size=106>
密码:<input id="userpwd" type="text" name="userpwd" size=106 style="width:50px">
<input name="content" type="checkbox")" value="checkbox" onclick="changeCheck()"/>
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<SCRIPT LANGUAGE="JavaScript">
<!--
function changeCheck()
{
var aa=document.getElementById("username");
var bb=document.getElementById("userpwd");
var cc=document.getElementById("content");
if(cc.checked)
{
aa.readonly=true;
bb.readonly=true;
aa.disabled = true;
bb.disabled = true;
}
else
{
aa.readonly=false;
bb.readonly=false;
aa.disabled = false;
bb.disabled = false;
}
}
//-->
</SCRIPT>

Note: is read-only and unavailable above. If it is generally unavailable, there is no need to read-only. It is ok. Select appropriately
There is no
ONCHANGE event in the HTML CHECKBOX control, only RADIO has it, and CHECKBOX only has the ONCLICK event

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