<!--js函數大致如下 -->
function del(){
var count = document.getElementById("count").value;
count--;
document.getElementById("count").value = count ;
if(count<=1){
document.getElementById("del0").style.display = block;
document.getElementById("del1").style.display = none;
}
if(count < total){//假定total是庫存量
document.getElementById("add0").style.display = block;
document.getElementById("add1").style.display = none;
}
}
function add(){
//......和del方法類似
}
<!-- 頁面處代碼大致如下 -->
<img id="del1"
src="...." onclick="del()" style="dispaly:block">
<img id="del0"
src="...." style="display:none">
<input type="text" id="count" readonly> 1 </input>
<img id="add1"
src="...." onclick="add()" style="dispaly:block">
<img id="add0"
src="...." style="dispaly:none">
很久沒寫代碼了,估計疏漏不少,不過大致是這樣的思路