01-初识jQuery

最新推荐文章于 2021-08-26 15:40:07 发布

iWarming

最新推荐文章于 2021-08-26 15:40:07 发布

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>01-初识jQuery</title>
  <style>
    *{
      margin: 0;
      padding: 0;
    }
    div{
      width: 100px;
      height: 100px;
      border: 1px solid #000;//边框
    }
  </style>
  <!--<script type="text/javascript" src="/src/js/jquery-3.3.1.js"></script>-->
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script>
    window.onload=function(ev){
      //1。利用原生JS查找DOM元素
      var div1 = document.getElementsByTagName("div")[0];
      var div2 = document.getElementsByClassName("box1")[0];
      var div3 = document.getElementById("box2");//id唯一
      // console.log(div1);
      // console.log(div2);
      // console.log(div3);
      //2.利用原生JS修改背景颜色
      //div1.style.backgroundColor = "red";
      //div2.style.backgroundColor = "blue";
      //div3.style.backgroundColor = "green";

    }
    $(function(){
      var $div1 = $("div")[0];
      var $div2 = $(".box1")[0];
      var $div3 = $("#box2")[0];

      //console.log($div1);
      //console.log($div2);
      //console.log($div3);
      //$div1.css("background-color","red");

      $div1.css({
        background: "red",
        width: "200px",
        height: "200px"
      });   //没能修改，原因未知
      $div2.css({"background": "red"});
      $div3.css({"background": "red"});
    });
  </script>
</head>
<body>
<div></div>
<div class="box1"></div>
<div id="box2"></div>
</body>
</html>