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)["backgroundColor"]);
    }

    //设置颜色
    var oBtn1=document.getElementById("btn1");
    var oBox1=document.getElementById("box1");

    oBtn1.onclick=function(){
        oBox1.style.backgroundColor="lightskyblue";
       // oBox1.style.border="2px solid black";
    }

//设置指定属性
    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;
    }


    //设置csstext属性
    var oBtn3=document.getElementById("btn3");
    var oBox3=document.getElementById("box3");

    oBtn3.onclick=function(){
        var val=document.getElementById("cssTextValue").value;
        

        oBox3.style.cssText=val;
    }
//切换样式
    var oBtn4=document.getElementById("btn4");
    var oBox4=document.getElementById("box4");

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

<!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">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>cssText属性：</label>
        <input id = "cssTextValue" type="text"></input>
        <br/>
        
        <button id="btn3">设置cssText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/> 

</body>
</html>

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

#box1{
    width:100px;
    height:100px;
    background-color:rgb(105, 208, 255);
} 

#box2{
    width:100px;
    height:100px;
    background-color:rgb(56, 255, 56);
} 

#box3{
    width:100px;
    height:100px;
    background-color:rgb(255, 103, 56);
} 

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

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