SOURCE

console 命令行工具 X clear

                    
>
console
window.onload=function(){
var oListenBtn=document.getElementById("listenBtn");
oListenBtn.addEventListener("click",function(){alert("第一次");},false);
oListenBtn.addEventListener("click",alertSecond,false);
oListenBtn.addEventListener("click",function(){alert("第三次");},false);


oListenBtn.removeEventListener("click",alertSecond,false);

var oPContent=document.getElementById("content");
oPContent.addEventListener("click",changeColor,false);
oListenBtn.addEventListener("click",changeBackgroundColor,false);

var oRemveBtn=document.getElementById("removeBtn");
oRemveBtn.addEventListener("click",function(){oPContent.removeEventListener("click",changeColor,false);},false);

var oPContent1=document.getElementById("content1");
oPContent1.onclick=function(){
    if(this.style.color=="red"){
        this.style.color="black";
    }
    else{
        this.style.color="red";
    }

    if(this.style.backgroundColor=="lightskyblue"){
        this.style.backgroundColor="white";
    }
    else{
        this.style.backgroundColor="lightskyblue";
    }
}

var oRemveBtn1=document.getElementById("removeBtn1");
oRemveBtn1.addEventListener("click",function(){oPContent1.onclick=function(){
    if(this.style.backgroundColor=="lightskyblue"){
        this.style.backgroundColor="white";
    }
    else{
        this.style.backgroundColor="lightskyblue";
    }
}},false);

document.addEventListener("keydown", function(event){
        console.log(event.type);
        console.log("你按下 " + event.keyCode);
        if (event.altKey) {
            console.log("你按下了Alt");
        }
        if (event.ctrlKey) {
            console.log("你按下了Ctrl");
        }
        if (event.shiftKey) {
            console.log("你按下了Shift");
        }
    }, false)

    document.addEventListener("keyup", function(event){
        console.log(event.type);
        console.log("你松开 " + event.keyCode);
        if (event.altKey) {
            console.log("你松开了Alt");
        }
        if (event.ctrlKey) {
            console.log("你松开了Ctrl");
        }
        if (event.shiftKey) {
            console.log("你松开了Shift");
        }
    }, false) 

}

function alertSecond(){
    alert("第二次");
}

function changeColor() {
    if (this.style.color == "red") {
        this.style.color = "black";
    }
    else {
        this.style.color = "red";
    }
}

function changeBackgroundColor() {
    if (this.style.backgroundColor == "lightskyblue") {
        this.style.backgroundColor = "white";
    }
    else {
        this.style.backgroundColor = "lightskyblue";
    }
} 

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <script>
      
    </script>
</head>
<body>
    <input id="btn" type="button" value="按钮"/>
    <br/>
    <br/>
    <input id="listenBtn" type="button" value="监听按钮"/>

    <div>
        <p id="content">广州新华学院</p>

        <button id="removeBtn">解除</button>
    </div>

    <div>
        <p id="content1">信息科学学院</p>

        <button id="removeBtn1">解除</button>
    </div>
</body>
</html>