如何找到输入字段上的正数和负数的数量？

Question

我的问题是有 3 个输入文本字段和一个按钮，无论用户输入并按下按钮，警报都应该说明文本字段上有多少负数和多少正数？

Answer 1

Here is a working example The code is explained as below.

If you want to enter a number in each of the text field and click the button which tells the number of positive and negative numbered entered then here is your code,

You HTML code,

<input id="one" type="text"/>
<input id="two" type="text"/>
<input id="three" type="text"/>
<input type="button" onclick="check();" value="check">

Now you can write the script as follows,

function check(){

    //Converting the values to integer
    var x = parseInt(document.getElementById("one").value);
    var y = parseInt(document.getElementById("two").value);
    var z = parseInt(document.getElementById("three").value);

    //Initializing the positive and negative count to 0 
    var posCount = 0;
    var negCount = 0;

    //Incrementing postive and negative count depending whether it is      positive or negative
    if(x>=0){
        posCount++;
    }else{
        negCount++;
    }
    if(y>=0){
        posCount++;
    }else{
        negCount++;
    }
    if(z>=0){
        posCount++;
    }else{
        negCount++;
    }
    alert("Positive numbers: "+posCount);
    alert("Negative numbers: "+negCount);
}