javascript中的$是什么意思？ [英] What does $ mean in javascript?

问题描述

我有这个代码可以使用（有人为我写了），但其中的$包含了我。我在网上看过它是一个标识符，但在我的情况下它不能作为标识符。我用其他任何东西替换$符号，后面的函数不起作用。这是代码：

I have this code that works (someone wrote it for me), but the $ in it eludes me. I have read online it's an identifier, but it doesn't work as an identifier in my case. I replace the $ sign by anything else, the function that follows doesn't work. Here's the code:

var modal = document.getElementById('modal');

var img = document.getElementsByClassName('.image');
var modalImg = $("#modal-img");
var captionText = document.getElementById("modal-text");
$('.image').click(function(){
    modal.style.display = "block";
    var newSrc = this.src;
    modalImg.attr('src', newSrc);
    captionText.innerHTML = this.alt;
});

var span = document.getElementsByClassName("close-x")[0];

span.onclick = function() {
  modal.style.display = "none";

谢谢



我尝试了什么：



我试过用getElementById之类的东西替换$ ，任何其他标识符等。

Thanks

What I have tried:

I have tried replacing the $ by stuff like getElementById, any other identifier, etc.

推荐答案

就在我身上。我在网上看过它是一个标识符，但在我的情况下它不能作为标识符。我用其他任何东西替换

in it eludes me. I have read online it's an identifier, but it doesn't work as an identifier in my case. I replace the

符号，后面的函数不起作用。这是代码：

sign by anything else, the function that follows doesn't work. Here's the code:

var modal = document.getElementById('modal');

var img = document.getElementsByClassName('.image');
var modalImg =

（ ＃模态-IMG）;
var captionText = document .getElementById（ modal-text）;

("#modal-img"); var captionText = document.getElementById("modal-text");

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