hai_zai的专栏

New Document function sum(){var amount = parseInt(document.getElementById("amount").value);var price = parseInt(document.getElementById("price").value);var money = parseInt(document.ge

Math的用法   //alert(Math.PI);//alert(Math.ceil(3.54));//alert(Math.floor(3.54));//alert(Math.round(3.54));var promote = new Array(3);promote[0] = "拍卖区又有新货到了，赶快来捡便宜啊......"promote[1]

New Document   function xs(){var oldImg=document.getElementById("oldimg");var btn=document.getElementById("btn1");btn.setAttribute("value","返回");oldImg.src="desk_001.jpg";btn.onclick=yc;

Date的用法   var nowDate = new Date();//alert(nowDate);alert(nowDate.getYear()+"-"+(nowDate.getMonth()+1)+"-"+nowDate.getDate()+" "+nowDate.getHours()+":"+nowDate.getMinutes()+":"+nowDate.getSeco

//更新图片function changeImg(){//图片对象var img = document.getElementById("imgId");//用随机数获取图片名称var num = "images/"+Math.floor(Math.random()*12+1)+".jpg";img.setAttribute("src",num);}//每个一秒钟刷新

function bgcolor1(obj){switch(obj.id){case '1':document.getElementById("b1").bgColor="green";break;case '2':document.getElementById("b1").bgColor="blue";break;case '3':document.g

New Document  function time(){var t=new Date();//获取系统当前时间var h=t.getHours();var m=t.getMinutes();var s=t.getSeconds();var result=h+":"+m+":"+s;//获取input框的对象var txtTime = document.get

//定义字符串var str = "abc";var str1 = new String("efg");//alert(str+123);//alert(str.toUpperCase());//大写//alert(str.toLowerCase());//小写//alert(str.indexOf('a'));//字串在对象中的索引位置//alert(str.subs

function add(a,b){alert(a+b);}//add();function funTest(){var a=11;var b=22;add(a,b);}//点击事件函数function clickFun(){//var form = document.getElementById("form1");//form.ac

Array用法    //数组定义的三种方式：//格式１：数组对象名称=new Array([元素个数])var arr1 = new Array(10);alert(arr1.length);　　 //格式２：数组对象名称=new Array([[元素1][，元素2，...]])     var arr2 = new Array([1,2,3,4]);　　 //格

function sum1(id){var x = parseInt(document.getElementById("x").value);var y = parseInt(document.getElementById("y").value);switch (id){case '1':sum = x+y;document.getElementById("sum").

function play()  {bgcolor="red"   var b=0;   var my=new Date();   var h=my.getHours();   var m=my.getMinutes();   var s=my.getSeconds();   var mth=my.getMonth();   var year=my.getFullY