console 命令行工具 X clear

console

window.onload = function() {
    //获取颜色
    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)["backroundColor"]);
    }

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

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

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

    oBtn2.onclick=function(){
         var attr=document.getElementById("attr").value;
         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("cssTestValue").value

         oBox3.style[attr]=val;
    }

    var oBtn4=document.getElementById("btn4");
    var oBox4=document.getElementById("box4");

    oBtn4.onclick=function(){
        oBox4.setAttribute("class","newBox");
    }

        var oBtn5=document.getElementById("btn5");
    var oBox5=document.getElementById('box5');
    oBtn5.onclick=function()
    {
        console.log("Line46:"+oBox5.style.width);//只能获取内部样式
        console.log("Line47"+getComputedStyle(oBox5).width);//经过计算后获取的样式
    }

}

<!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>
    <br/> 
         <div>
        <button id="btn1" style="backgroundColor:lightskyblue">设置颜色</button>
        <div id="box1"></div>
    </div>
    <br/> 
     <div>
        <label>属性：</label>
        <input id = "attr" type="text"></input>
        <br/>
        <label>取值：</label>
        <input id = "val" type="text"></input>
        <br/>
        <button id="btn2">设置样式属性</button>
        <div id="box2"></div>
    </div>
    <br/> 
         <div>
        <label>cssTest属性：</label>
        <input id = "val" type="text"></input>
        <br/>
        <button id="btn3">设置样式属性</button>
        <div id="box3"></div>
    </div>
    <br/> 
    <div>
        <button id="btn4">切换样式</button>
        <div id="box4" class='oldBox'></div>
    </div>
    <br/>
    <div>
        <button id="btn5">获取宽度</button>
        <div id="box5" class='oldBox'></div>
    </div>
    <br/>
</body>
</html>

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

#box1{
    width:100px;
    height:100px;
    background-color:aquamarine;
} 
#box2{
    width:100px;
    height:100px;
    background-color:rgb(100,100,100);
} 
#box3{
    width:100px;
    height:100px;
    background-color:rgb(200,100,100);
} 
#box4{
    width:100px;
    height:100px;
    background-color:rgb(200,100,100);
} 
.oldBox{
    width:100px;
    height:100px;
    background-color:royalblue;
}

.newBox{
    width:50px;
    height:50px;
    background-color:lightskyblue;
    border:2px solid black;
}