Small white for help! JSP to send values to js and function!!!!!!-CodePudding

This is a JSP interface code:

</script>

This is js interface corresponding with reference function:
The function updateCart (quantity) {
The sendRequest (" updateCartJSServlet? Quantity="+ quantity);
}

After this operation js function cannot receive send it to the JSP interface parameters! Quantity value is empty, how should consult operation to make it can pass normal value! Thank you bosses!