Question

有人可以建议我如何让我的最终变量显示为数字（我的函数变量的值）而不是NaN？

<form id="computeroi">
                <fieldset>
                    <div class="col-1 pblue"> <p class="float-left"> 1. How many monthly visitors does your website get per month? </p>  <input type="number" value="0" id="monthlyvisitors" class="width-50" onchange="computeroi()"> </div>
                    <div class="col-1 pblue"> <p class="float-left"> 2. How many of those visitors are from a mobile device? </p>  <input type="number" value="0" id="mobilevisitors" class="width-50" onchange="computeroi()"> </div>
                    <div class="col-1 pblue"> <p class="float-left"> 3. What is your average deal worth ? </p>  <input type="number" value="0" id="dealworth" class="width-50" onchange="computeroi()"> </div>
                    <div class="col-1 pblue"> <input type="submit" value="Submit" class="width-25" id="submit" width="25"> </div>
                    <div class="col-1 "> <h1 id="newdealw"> </h1> </div>
                </fieldset>
            </form>

function computeroi() {
var monthlyv = document.getElementById('monthlyvisitors').value;
var mobilet = document.getElementById('mobilevisitors').value;
var dealw = document.getElementById('dealworth').value;

var newdeals = (mobilevisitors / monthlyvisitors); 
var newdealw = (newdeals * dealworth);

document.getElementById('newdealw').innerHTML = newdealw;

}

Answer 1

mobilevisitors，monthlyvisitors，dealworth未在您的方法中的任何位置声明或定义。

而是将ids monthlyvisitors，mobilevisitors，dealworth的值分配到monthlyv，mobilet，dealw

var monthlyv = document.getElementById('monthlyvisitors').value;
var mobilet = document.getElementById('mobilevisitors').value;
var dealw = document.getElementById('dealworth').value;

试试这个

var monthlyv = document.getElementById('monthlyvisitors').value;
var mobilet = document.getElementById('mobilevisitors').value;
var dealw = document.getElementById('dealworth').value;

var newdeals = ( +mobilet / +monthlyv ); 
var newdealw = (newdeals * +dealw );

变量前的

N：b： +符号会将其视为数字。

Answer 2

var monthlyv = document.getElementById('monthlyvisitors').value;
var mobilet = document.getElementById('mobilevisitors').value;
var dealw = document.getElementById('dealworth').value;

var newdeals = (mobilevisitors / monthlyvisitors); 
var newdealw = (newdeals * dealworth);

代码中没有mobilevisitors，monthlyvisitors个变量。

在执行数学运算之前也要相应地使用parseInt()或parseFloat()。

Answer 3

您的代码中没有mobilevisitors，monthlyvisitors变量。 juste改变了最后两行：

var newdeals = (mobilet / monthlyv); 
var newdealw = (newdeals * dealw);

Answer 4

您尚未声明变量 mobilevisitors 或此 monthlyvisitors ，因此您无法获得价值。你应该使用变量monthlyv和mobilet来获得这两件事的价值（移动顾问和月度访问者）

显示NaN的Javascript变量

4 个答案: