javascript - 如何比较两个函数中定义的两个JavaScript变量值

Question

我有两个如下所示的 JavaScript 函数，它们将计算文本区域中的非空行。

HTML:

<div id="map-devlist" >
    <div class="block-with-text-area">
    <div class="input-quest-with-text-area">Enter your device list(one device in one line)</div>
    <div class="input-resp-with-text-area"><span><textarea  class="textarea" id="devs" name="devs" type="text" onkeyup="devscount();"></textarea></span> </div> 
    </div>
</div>

<div id="lunidlist" >
    <div class="block-with-text-area">
        <div class="input-quest-with-text-area">Enter your LUN IDs in Hex(one ID in one line)</div>
        <div class="input-resp-with-text-area"><span><textarea  class="textarea" id="lunids" name="lunids" type="text" onkeyup="luncount();"></textarea></span> </div>  
    </div>
</div>

<div id="error1"></div>

Javascript:

function devscount()
{
    devcounts = 0;
    var lines = $("#devs").val().split("\n");
    for (var i = 0; i < lines.length; i++) {
        if (lines[i].length > 0) devcounts++;
    }
}   

function luncount()
{
    luncounts = 0;
    var lines = $("#lunids").val().split("\n");
    for (var i = 0; i < lines.length; i++) {
        if (lines[i].length > 0) luncounts++;
    }

    if(devcounts == luncounts) {
        var message ="both counts are matching";
    } else {
        var message ="Mismatch between values";
        document.getElementById('error1').innerHTML=message;
    }
}

现在我想比较这两个文本区域的行数，如果它们相等或不相等，我需要显示一条消息。但上面的脚本对我不起作用。当我在相应的函数上 echo document.getElementById('error1').innerHTML=devscount; 和 document.getElementById('error1').innerHTML=luncounts; 时，它完美显示行数。但我无法比较他们的值(value)观。如何做到这一点？

JSFIDDLE SETUP

Answer 1

你的jsfiddle的问题不仅仅是这个问题。您尝试检查值的方式也存在问题。两个文本区域在按键时运行函数来计算其中的项目，但不运行比较代码。我将它们都更改为运行第三个函数 checkcounts，并将脚本修改为此...

var devcounts;
var luncounts;

function devscount() {
    devcounts = 0;
    var lines = $("#devs").val().split("\n");
    for (var i = 0; i < lines.length; i++) {
        if (lines[i].length > 0) devcounts++;
    }
}   

function luncount() {
    luncounts = 0;
    var lines = $("#lunids").val().split("\n");
    for (var i = 0; i < lines.length; i++) {
        if (lines[i].length > 0) luncounts++;
    }
}

function checkcounts() {
    devscount();
    luncount();

    var message;

    if(devcounts == luncounts) {
        message ="both counts are matching";
    } else {
        message ="Mismatch between values";
    }

    document.getElementById('error1').innerHTML=message;
}

<强> Working jsfiddle...