設定輸入字段的值

Question

<script> 
function doMath() { 
    var labor = parseInt(document.getElementById('prod_price').value); 
    var tax = labor * .10; 

    document.getElementById('prod_description').value = tax; 
} 
</script> 
<div>Price: <input type="text" id="prod_price" onBlur="doMath();" /></div> 
<div>Tax: <input type="text" id="prod_description" readonly="true" /></div> 

如何使此one..if價格低於100，則稅必須顯示爲5 並且如果價格比100最高，然後稅必須在20

Answer 1

試試這個..

function doMath() { 
    var labor = parseInt(document.getElementById('prod_price').value); 
    if(labor<100) 
    { 
     document.getElementById('prod_description').value = "5"; 
    } 
    else if(labor>100) 
    { 
     document.getElementById('prod_description').value = "20"; 
    } 
}