$(function() {
$("#plus").click(function() {
var n = $("#number").val(),
num = parseInt(n) + 1;
if (num == 0) {
alert("cc");
}
n.val(num);
});
$("#minis").click(function() {
var n = $("#number").val(),
num = parseInt(n) - 1; <br>//小於1的時候,默認取值爲1
num = num < 1 ? 1 : num;
n.val(num);
});
});
html代碼如下:
<section class="quantity">
<h4>數量:</h4>
<div class="number_con">
<span id="minis" class="minus" >-</span>
<div class="input"><input id="number" type="text" value="1"></div>
<span id="prus" class="plus on">+</span>
</div>
</section>