调用我的Javascript函数不起作用

Question

I'm using the following JavaScript / HTML:

<select id="mySelect" onchange="myFunction()">
  <option value="">Select
  <option value="150">USA
  <option value="50">Canada
  <option value="200">UK
  <option value="75">Kenya
</select>

<script>
    simpleCart.shipping(function myFunction(){
    var x = simpleCart.quantity();
    var y = document.getElementById("mySelect").value;
        if( x > 0 ){
             return y * x;
         } else {
             return 0;
         }
    });
</script>

Currently, I can't call myFunction() onchange for some reason. What do I need to change so that I can call myFunction() ?

Answer 1

You could try wrapping the function like:

<script>
function myFunction() {
    simpleCart.shipping(function(){
    var x = simpleCart.quantity();
    var y = document.getElementById("mySelect").value;
        if( x > 0 ){
             return y * x;

         } else {
             return 0;
         }
    });
}
</script>