js click text box content exchange code
A relatively simple js code is used to exchange the content of the text box by clicking on the middle switch button, and the city content is exchanged. In addition to location exchange, of course it can also be used for other purposes.
js code
<script type="text/javascript">
function change(){
var num1 = document.getElementById("num1").value;
var num2 = document.getElementById("num2").value;
{
document.getElementById("num2").value = num1;
document.getElementById("num1").value = num2;
}
}
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