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

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

    //获取样式属性
    var oBtn5 = document.getElementById("btn5");
    var oBtn6 = document.getElementById("btn6");

    oBtn5.onclick = function(){
        console.log("line 52:" + oBox3.style.width);
        console.log("line 56:" + getComputedStyle(oBox3).width);
    }
    oBtn6.onclick = function(){
    console.log("line 57:" + oBox4.style.width);
    console.log("line 58:" + 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>
    <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">设置指定属性</button>
        <div id="box2" style="background-color:hotpink;border:2px solid black;width:50px;height:50px"></div>
    </div>
    <br/> 
    <div>
        <label>cssText属性：</label>
        <input id = "cssTextBalue" type="text"></input>
        <br/>
        <button id="btn3">设置cssText属性</button>
        <div id="box3"></div>
        <button id="btn5">获取宽度</button>
    </div>
    <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:lightskyblue;
} 

#box2{
    width:100px;
    height:100px;
    background-color:rgb(240, 71, 20);
} 

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

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

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