如何更改JavaScript中的值？

Question

I have the folowing code:

var price1 = (length1 * width1) * priceSM / 10000;
if (price1 < 10) {
    alert("Size too small");
    return;
}
document.getElementById('result1').innerHTML = Math.round(price1);

What I need to do:

If price 1 < 10 alert AND then price1 = 10, but if price1 = 0, or bigger than 10, that's fine.

length1 and width1 are INPUTS

Please help, I'm at very beginning with javascript.

Answer 1

I don't know if I understand well what you want. Try this ?

var price1=(length1*width1)*priceSM/10000;
if(price1 < 10 && price1 != 0){
    alert("Size too small");
    price1 = 10;
    return;
}
document.getElementById('result1').innerHTML=Math.round(price1);

If you want to update your element "result1" with price1 when < 10 then just remove "return;"

If it isn't what you want, please tell us and post all function's code please.

Answer 2

To avoid the alert when the price is zero, add that in the condition with the && operator:

price1 > 0 && price1 < 10

To set the price to 10 in that case, add this to the if block:

price1 = 10

To really show the modified price (10), you should remove the return statement from that if block. That way the code will continue to execute the last statement.

Finally, not really a problem, but it is better to use the textContent property instead of the innerHTML property when you intend to assign something that is plain text and not HTML.

So your code then becomes:

var price1 = (length1 * width1) * priceSM / 10000;
if (price1 > 0 && price1 < 10) {
    price1 = 10
    alert("Size too small");
}
document.getElementById('result1').textContent = Math.round(price1);

Answer 3

使用.value属性，您可以设置值。

document.getElementById("myText").value = "Hello World...";