有没有大神帮我看看这段程序哪里有问题？为啥我点加减都没有效果
慕莱坞4462739
2017-05-03 22:01
num.onclick = function (e) {
e = e || window.event;
var el = e.srcElement;
var cls = el.className;
var input = this.getElementsByTagName('input'); //取得input的值
var val = parseInt(input.value);
var reduction = this.getElementsByClassName('reduction');
switch (cls) {
case 'plus':
input.value=val+1;
break;
case 'reduction':
input.value=val-1;
break;
default:
break;
}
}
1回答
-
- Ted688
- 2017-05-13 16:49:49
num.onclick = function (e) {//num是哪一行
e = e || window.event;
var el = e.srcElement;
var cls = el.className;
var input = this.getElementsByTagName('input')[1]; //取得input的第几个值
var val = parseInt(input.value);
var reduction = this.getElementsByClassName('reduction');
switch (cls) {
case 'plus':
val++;
input.value=val;
break;
case 'reduction':
val--;
input.value=val;
break;
default:
break;
}
}
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