题解 | #购物面板#

const addChickenBtn=document.getElementById("zjtaishaola")
            const minusChickenBtn=document.getElementById("zjtaiduola")
            const chicken=document.getElementById("zjsl")
            const addColaBtn=document.getElementById("kltaishaola")
            const minusColaBtn=document.getElementById("kltaiduola")
            const cola=document.getElementById("klsl")
            const allCost=document.getElementById("total")


            addChickenBtn.onclick=function(){
                let count=parseInt(chicken.innerText)
                chicken.innerText=`${++count}`
                let cost=parseInt(allCost.innerText)
                allCost.innerText=`${cost+28}`
            }
            minusChickenBtn.onclick=function(){
                let count=parseInt(chicken.innerText)
                if(count>0){
                    chicken.innerText=`${--count}`
                    let cost=parseInt(allCost.innerText)
                    allCost.innerText=`${cost-28}`
                }
            }

            addColaBtn.onclick=function(){
                let count=parseInt(cola.innerText)
                cola.innerText=`${++count}`
                let cost=parseInt(allCost.innerText)
                allCost.innerText=`${cost+5}`
            }
            minusColaBtn.onclick=function(){
                let count=parseInt(cola.innerText)
                if(count>0){
                    cola.innerText=`${--count}`
                    let cost=parseInt(allCost.innerText)
                    allCost.innerText=`${cost-5}`
                }
            }