console 命令行工具 X clear

console

window.onload=function()
{
   var oBtn=document.getElementById("btn");
   var oBox=document.getElementById("box");

   oBtn.onclick=function(){
       console.log("line 7:"+getComputedStyle(oBox).backgroundColor);
        console.log("line 8:"+getComputedStyle(oBox)["backgroundColor"]);
   }

   var oBtn1=document.getElementById("btn1");
   var oBox1=document.getElementById("box1");

   oBtn1.onclick=function(){
       oBox1.style.backgroundColor="lightskyblue";
   }

    var oBtn2=document.getElementById("btn2");
   var oBox2=document.getElementById("box2");

   oBtn2.onclick=function(){
      
       var val=document.getElementById("val").value;
 
       oBox2.style[attr]=val;
   }
   var oBtn3=document.getElementById("btn3");
   var oBox3=document.getElementById("box3");

   oBtn3.onclick=function(){
      
       var val=document.getElementById("cssTextVal").value;
    
       oBox3.style.cssText=val;
   }
    var oBtn4=document.getElementById("btn4");
   var oBox4=document.getElementById("box4");

   oBtn4.onclick=function(){
       oBox4.className="newBox";

   }
      var oBtn5=document.getElementById("btn5");
   oBtn5.onclick=function(){
     console.log("line 50:"+oBox3.style.width);
         console.log("line 51:"+getComputedStyle(oBox3).width);
   }
   var oBtn6=document.getElementById("btn6");
   oBtn6.onclick=function(){
     console.log("line 56:"+oBox4.style.width);
         console.log("line 57:"+getComputedStyle(oBox4).width);
   }
}

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <style type="text/css">   
    </style>
    <script>
       
    </script>
</head>
<body>
    <div>
        <button id="btn">获取颜色</button>
        <div id="box"></div>
        </div>
<div>
        <button id="btn1">设置颜色</button>
        <div id="box1"></div>
        </div>
<div>
    <label>属性：</label>
        <input id = "attr" type="text"></input>
        <label>取值：</label>
        <input id = "val" type="text"></input>
        <button id="btn2">设置样式属性</button>
        <div id="box2"></div> 
<div>
        <label>cssText属性：</label>
        <input id = "cssTextVal" type="text"></input>
        <br/>
        <button id="btn3">设置cssText</button>
        <div id="box3"></div>
         <button id="btn5">获取宽度</button>
    </div>
    <br/>
    <br/>
    <div>
        <button id="btn4">切换样式</button>
        <div id="box4" class="oldBox"></div>
         <button id="btn6">获取宽度</button>
    </div>
    <br/> 
</body>
</html>

#box{
    width:100px;
    height:100px;
    background-color:hotpink;
}

#box1{
    width:100px;
    height:100px;
    background-color:royalblue;
}

#box2{
    width:100px;
    height:100px;
    background-color:rebeccapurple;
}


#box3{
    width:100px;
    height:100px;
    background-color:aquamarine;
}

.oldBox{
    width:100px;
    height:100px;
    background-color:indianred;
}

.newBox{
    width:50px;
    height:50px;
    background-color:coral;
}