javascript - jQuery/JavaScript : Subtract current 'value' till 'Zero'

Question

这是一个简单的；假设我有一个从数据库中提取值的脚本，每次用户单击一个按钮时，该值都会减少一个计数，我该如何防止该值减少到零以下，

 if(count>0){
           $.post(sessionStorage.server, { count:count ,request:"counter",user:sessionStorage.sname });
        }

if(count==0){
            alert("Your value is now zero");
            sessionStorage.clear();
            sessionStorage.msg="Logged off, ran out of clicks";
            window.location.href = "../index.html";
        }

Answer 1

试试这个

if(count==0){
            alert("Your value is now zero");
            sessionStorage.clear();
            sessionStorage.msg="Logged off, ran out of clicks";
            window.location.href = "../index.html";
        }
else if(count>0){
           $.post(sessionStorage.server, { count:count ,request:"counter",user:sessionStorage.sname });
        }