Javascript 如何检测div中每个图像的alt文本并执行if语句

我想问您，如何获得div中每个图像的

alt

attr，并根据值执行if语句：

例如：

<div id="images">
  <img src="image1" alt="img1">
  <img src="image1" alt="img1">
  <img src="image2" alt="img2">
  <img src="image1" alt="img1">
  <img src="image3" alt="img3">
</div>

提前谢谢

$("#images img").each(function() {
    switch (this.alt) {
    case "img1":
        /* do something */
        break;
    case "img2":
        /* do something else */
        break;
    ...
    default: 
        /* do default thing */
    }
});

$("#images img").each(function() {
    switch (this.alt) {
    case "img1":
        /* do something */
        break;
    case "img2":
        /* do something else */
        break;
    ...
    default: 
        /* do default thing */
    }
});

$("#images img").each(function(){
   if($(this).attr('alt') == 'img1') { /* do something*/ }
});