在这里,我想从用户那里获取信息。拆分并将它们存储到数组中。然后显示数组的总和。
<!-- for taking inputs -->
<input id="seriesInput" type="text" placeholder="please use space">
<!-- for submitting inputs -->
<input id="submiting" onclick="seriesFunction()" value="Submit" type="button">
<!-- for placing results -->
<div> Summation is <span id="sum"></span> </div>
<script type="text/javascript">
function seriesFunction()
{
value = document.getElementById("seriesInput").value;
// splitting string in an array
value_arr = value.split(" ");
alert(value_arr);
// calling reduce method for summation
var sum = value_arr.reduce(get_sum,0);
// assigning result
document.getElementById("sum").innerHTML =sum;
alert(sum);
function get_sum(total, currentVal) {
total += currentVal;
return total;
}
}
</script>
答案 0 :(得分:1)
你在get_sum函数中将currentValue作为字符串获取,尝试使用整数。你可以这样做:
function get_sum(total, currentVal) {
currentVal = parseInt(currentVal);
total += currentVal;
return total;
}
答案 1 :(得分:1)
您需要将代码修改为:
function get_sum(total, currentVal) {
total += +currentVal;
return total;
}
在+
前面注意currentVal
。这会将字符串转换为数字而不仅仅是int
。所以好处是,如果你输入三个值,如1.1 1.2 1.3,你将得到总和为6.6。
在没有这个的情况下,你早些时候正在进行字符串连接,而不是你打算做的总和。
function seriesFunction() {
value = document.getElementById("seriesInput").value;
// splitting string in an array
value_arr = value.split(" ");
alert(value_arr);
// calling reduce method for summation
var sum = value_arr.reduce(get_sum, 0);
// assigning result
document.getElementById("sum").innerHTML = sum;
alert(sum);
function get_sum(total, currentVal) {
total += +currentVal;
return total;
}
}
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<input id="seriesInput" type="text" placeholder="please use space">
<!-- for submitting inputs -->
<input id="submiting" onclick="seriesFunction()" value="Submit" type="button">
<!-- for placing results -->
<div> Summation is <span id="sum"></span> </div>
&#13;