MOUSEOVER MOUSEENTER_mouseenter在cdn引用時不生效-优快云博客

本文链接：https://blog.youkuaiyun.com/u011594442/article/details/47275479

<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
x=0;
y=0;
$(document).ready(function(){
$("div.over").mouseover(function(){
$(".over span").text(x+=1);
});
$("div.enter").mouseenter(function(){
$(".enter span").text(y+=1);
});
});
</script>
</head>
<body>
<p>不论鼠标指针穿过被选元素或其子元素，都会触发 mouseover 事件。</p>
<p>只有在鼠标指针穿过被选元素时，才会触发 mouseenter 事件。</p>
<div class="over" style="background-color:lightgray;padding:20px;width:40%;float:left">
<h2 style="background-color:white;">被触发的 Mouseover 事件：<span></span></h2>
</div>
<div class="enter" style="background-color:lightgray;padding:20px;width:40%;float:right">
<h2 style="background-color:white;">被触发的 Mouseenter 事件：<span></span></h2>
</div>
</body>

</html>

var obj = {
	a:1,
	b:function(){console.log(this.a)}
};

var a = 2;
var objb = obj.b;

obj.b();
objb();
obj.b.call(window);

//1
//2
//2

function A(){

}
function B(a){
	this.a = a;
}
function C(a){
	if(a){
		this.a = a;
	}
}

A.prototype.a = 1;
B.prototype.a = 1;
C.prototype.a = 1;

console.log(new A());
console.log(new B());
console.log(new C(2));


//A{a = 1}
//B{a=undefined}
//C{a = 2}

var a = 1;
function b (){
	var a = 2;
	function c() {
		console.log(a);
	}

	return c;
}

b()();

//2