Javascript将整数添加为字符串

Question

http://jsfiddle.net/rniemeyer/4FdcY/

例如，如果添加范围为1-2的6和4，则得到641或642而不是11或12！

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function calculate()
{
  var radius1 = document.getElementById("cell1Value").value;
  var radius2 = document.getElementById("cell2Value").value;
  var radiusAvrg = (radius1 + radius2) / 2;
  var childRadius = radius1 + radius2 + (Math.floor(Math.random() * 6) + 1);
  console.log(childRadius);
  confirm("The child's radius is " + childRadius);
}

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<h1>ParentCell01's Radius</h1>
<input type="text" name="cell1Value" id="cell1Value" />
<br />
<h1>ParentCell02's Radius</h1>
<input type="text" name="cell2Value" id="cell2Value"/>
<br />
<button onclick="calculate()">Calculate child's radius.</button>

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Answer 1

您需要将值转换为数字：

var radius1 = +document.getElementById("cell1Value").value;
var radius2 = +document.getElementById("cell2Value").value;

Answer 2

在进行像

这样的数学运算之前，需要解析包含int值的字符串

var radius1 = parseInt(document.getElementById("cell1Value").value);

Answer 3

这里你的功能应该是这样的。

 function calculate()
        {
            var radius1 = parseInt(document.getElementById("cell1Value").value);
            var radius2 = parseInt(document.getElementById("cell2Value").value);
            var radiusAvrg = (radius1 + radius2) / 2;
            var childRadius = radius1 + radius2 + (Math.floor(Math.random() * radiusAvrg) + 1);
            console.log(childRadius);
            confirm("The child's radius is " + childRadius);
        }