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 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("cssTextVal").value;
        console.log(val);

        oBox3.style.cssText= val;
    }

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

//切换样式，切换css样式
    oBtn4.onclick = function(){
        
        //oBox4.className = "newBox";
        oBox4.setAttribute("class","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>
    <br/>
    <div>
        <button id="btn1" style="">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 = "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:aqua;
}

#box2{
    width:100px;
    height:100px;
    background-color:blueviolet;
}
 
 #box3{
    width:100px;
    height:100px;
    background-color:blanchedalmond;
}

.oldBox{
    width:100px;
    height: 100px;
    background-color:blue;
}
 .newBox{
    width:100px;
    height: 100px;
    background-color:greenyellow;
}