console
function alertSecond() {
alert("第2次");
}
function changeColor() {
if (this.style.color == "red") {
this.style.color = "black";
}
else {
this.style.color = "red";
}
}
function changeBackgroundColor() {
console.log(this.textContent);
if (this.style.backgroundColor == "lightskyblue") {
this.style.backgroundColor = "white";
}
else {
this.style.backgroundColor = "lightskyblue";
}
}
function changeColorAndBackgroundColor() {
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";
}
}
window.onload = function ()
{
//事件处理器 处理了以后只会执行最后一个步骤
var oBtn = document.getElementById("btn");
oBtn.onclick = function () {
alert("第1次");
};
oBtn.onclick = function () {
alert("第2次");
};
oBtn.onclick = function () {
alert("第1次");
alert("第2次");
alert("第3次");
};
//事件监听器 写了即执行
//监听按钮 添加监听add 删除监听remove
var oBtn = document.getElementById("listenBtn");
oBtn.addEventListener("click", function(){
alert("第1次");
}, false);
oBtn.addEventListener("click", alertSecond, false);
//oBtn.removeEventListener("click", alertSecond, false);
//广州新华学院
var oPContent = document.getElementById("content");
oPContent.addEventListener("click", changeColor, false);
oPContent.addEventListener("click", changeBackgroundColor, false);
//点了解除按钮之后，将删除监听不改变字体颜色
var oBtn = document.getElementById("removeBtn");
oBtn.addEventListener("click", function(){
oPContent.removeEventListener("click", changeColor, false);
}, false);
//信息科学学院
var oPContent1 = document.getElementById("content1");
oPContent1.onclick = changeColorAndBackgroundColor;
var oBtn1 = document.getElementById("removeBtn1");
oBtn1.addEventListener("click", function(event){
console.log(event.type);
oPContent1.onclick = changeBackgroundColor;
}, false);
//event对象的类型以及数值
document.addEventListener("keydown", function(event) {
console.log(event.type);
if (event.shiftKey || event.altKey || event.ctrlKey){
console.log("你按下啦 shift, alt 或者ctrl");
}
console.log("你按下啦 " + event.keyCode);
}, false);
document.addEventListener("keyup", function(event) {
console.log(event.type);
console.log("你松开啦 " + event.keyCode);
})
}
<!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"/>
<br/>
<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>