[英]Why is this simple javascript program not working?
警報窗口給我留言NaN出了什么問題? 謝謝所有的幫助
var weight = parseFloat(document.BMI.weight.value)
var height = parseFloat(document.BMI.height.value)
function calcBMI() {
var answer = weight * 703 / (height*height)
return answer;
}
</script>
<form action="" name="BMI">
<input type="text" name="weight" />
<input type="text" name="height" />
<input type="submit" onclick="alert(calcBMI())" />
</form>
<script type="text/javascript">
function calcBMI() {
var weight = parseFloat(document.BMI.weight.value)
var height = parseFloat(document.BMI.height.value)
var answer = weight * 703 / (height*height)
return answer;
}
</script>
<form action="" name="BMI">
<input type="text" name="weight" />
<input type="text" name="height" />
<input type="submit" onclick="alert(calcBMI())" />
</form>
希望它現在有效:)
您需要將變量移動到函數調用中。 *編輯..我被擊敗了。
<form action="" name="BMI">
<input type="text" name="weight" />
<input type="text" name="height" />
<input type="submit" onclick="alert(calcBMI())" />
</form>
<script type="text/javascript">
function calcBMI() {
var weight = parseFloat(document.BMI.weight.value)
var height = parseFloat(document.BMI.height.value)
var answer = weight * 703 / (height*height)
console.log(weight);
return answer;
}
</script>
function calcBMI() {
var weight = parseFloat(document.BMI.weight.value)
var height = parseFloat(document.BMI.height.value)
var answer = weight * 703 / (height*height)
return answer;
}
</script>
本地和grobal變量存在問題。 當您單擊該按鈕時,該功能不會從文本框中獲取值
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