题解 | #购物面板#

利用id可以直接取值的特性和闭包

<script type="text/javascript">
    // 补全代码
    function get(type, operate) {
        if (type.innerText <= 0 && operate === "-") { return }
        if (operate == "+") {
            type.innerText = Number(type.innerText) + 1 
        } else {
            type.innerText = Number(type.innerText) - 1 
        }
        total.innerText = Number(zjsl.innerText) * 28 + Number(klsl.innerText) * 5
    }
    function handleClick(type, operate) {
        return function () {
            get(type, operate)
        }
    }

    zjtaiduola.onclick = handleClick(zjsl, "-")
    zjtaishaola.onclick = handleClick(zjsl, "+")
    kltaiduola.onclick = handleClick(klsl, "-")
    kltaishaola.onclick = handleClick(klsl, "+")
</script>