javascript学习笔记

var i = 0;
var j = ‘0‘;

i ==j // true
i === j // false

<div id=‘test‘>
    <button id="btn"/>
　　<a href="www.baidu.com" id="bd">百度</a>
</div>

<script>
    document.getElementById(‘btn‘).addEventListener(‘click‘,demo1);
    document.getElementById(‘b‘).addEventListener(‘click‘,demo2);

    document.getElementById(‘bd‘).addEventListener(‘click‘,demo3);

function demo1(e){ alert(‘test1‘);
　　  //e.stopPropagation();// 阻止事件冒泡
}        

    function demo2(){
     alert(‘test2‘);
}     

 function demo3(e){
     alert(‘test3‘);
　　  e.preventDefault();// 阻止默认行为
}    

</script>

<!--创建对象-->
    /*方法一*/
    people = new Object();
    people.age = 15;
    people.name = ‘baohua‘;
    document.write(‘姓名：‘+people.name+"年龄："+people.age);
    /*方法二*/
    animal = {
        age  : 20,
        type : ‘dog‘,
        voice : function (){
        alert(‘brak‘);
    }
    };
    document.writeln(‘动物类型：‘+animal.type+"动物年龄："+animal.age);
    animal.voice();

    /*方法三*/
    function  plant(type,name) {
        this.type = type;
        this.name = name;
    }

    flower = new plant(‘flower‘,‘玫瑰‘);
    document.writeln("植物类型："+flower.type+"植物名字："+flower.name);