浅谈JS中的常用选择器及属性、方法的调用

时间:2020-05-16 人气:0

选择器、属性及方法调用的配合使用：

<style>
      #a{
        width: 200px;
        height: 100px;
        background-color: red;
        
      }
      .b{
        width: 200px;
        height: 100px;
        background-color: green;
        
      }
      .div1{
        width: 200px;
        height: 100px;
        background-color:aqua;
      }
    </style>

  <body>
    <div id="a"></div>
    <div class="b" style="background-color: black;"></div>
    <div class="b" style="background-color: chartreuse;"></div>
    <div class="div1">精英教育</div>
    <input type="text" name="ipt1" />
    <input type="checkbox" name="ckb2" / disabled="disabled">
  </body>
  
  <script>
    //先选择元素在进行加效果
    //ID选择器(使用较高JS)
    var a = document.getElementById("a");
    //检测类型
    alert(typeof(document.getElementById("a")))
    
    a.style.backgroundColor="royalblue";
    
    a.innerHTML ="<span>hello<span>";
    a.innerText = "<span>hello<span>";
//    class选择器
    var b_class = document.getElementsByClassName("b");
    b_class[0].style.backgroundColor="red";
    
    var b_class = document.getElementsByClassName("b");
    b_class[1].style.backgroundColor="blueviolet";
//    标签选择器
    var b_b = document.getElementsByTagName("div");
    b_b[1].style.backgroundColor="yellow";
    
    var div_1 = document.getElementsByName("ipt1");
    div_1[0].value="文本框";
    
    var ckb2 = document.getElementsByName("ckb2")[0];
    ckb2.setAttribute("checked","");
  //移除属性
    ckb2.removeAttribute("disabled")
    
  //创造元素
   var a = document.createElement("a");
   a.setAttribute("href","http://www.baidu.com");
   a.innerText="百度一下";
   
   document.body.appendChild(a);
   document.body.removeChild(a);
   
  div1.appendChild(a);
  
    
  </script>

<body>
    <!--DOM  Document Object Model
    BOM  Bowers O M-->
    <div id="div1" class="div1"></div>
    <div class="div1"></div>
    <input type="text" name="ipt1" />
    <input type="checkbox" name="ckb1" disabled="disabled"/>
  </body>
</html>
<script>
//  alert('1111');
//  window.alert('123')
  var div1 = document.getElementById('div1');
  div1.style.backgroundColor = 'red';
//  div1.innerHTML = "<ul><li>123456</li></ul>";
  div1.innerText = "<ul><li>123456</li></ul>";
  
  
  var div1_class = document.getElementsByClassName('div1');
  div1_class[1].style.backgroundColor = "green";
  
  var div1_1 = document.getElementsByTagName('div');
  div1_1[1].style.backgroundColor = "blue";
  
//  jQuery
  var div1_2 = document.getElementsByName('ipt1');
  div1_2[0].value = '123';
  
  var ckb1 = document.getElementsByName('ckb1')[0];
//  ckb1.setAttribute("checked","checked");
  ckb1.removeAttribute('disabled');
  
  var a = document.createElement("a");
  a.setAttribute("href","http://www.baidu.com");
  a.innerText = "百度";
  
  document.body.appendChild(a);
  document.body.removeChild(a);
  
  div1.appendChild(a);
</script>

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