javascript基本类型和对象类型

基本类型

<script type="text/javascript"> var a = 3.14, b = a;//a 的值赋值给b a = 10;//a的值改变 alert(b); </script>

对象类型 object

<script type="text/javascript"> var a = { name: 'Colin', age: 24, Height: '173cm' }; window.option = a; option.name = 'Jerry'; alert(a.name); </script>

对象类型 Array

<script type="text/javascript"> var arr = [1, 2, 3]; var b = arr; b[0] = 4; alert(arr[0]) </script>

对象类型 DOM

<style type="text/css">.red{color:red}.blue{color:blue}</style> <div id="demo1"><span class="red">Hello world!</span></div> <script type="text/javascript"> var obj = document.getElementById('demo1').getElementsByTagName('span')[0]; var myInst = obj; myInst.className = 'blue'; var objStr = document.getElementById('demo1').innerHTML; var myStr = objStr; myStr = myStr.replace(/blue/g, 'blue'); alert("myStr = " + myStr); alert("obj.innerHTML = " + obj.innerHTML); </script>