javascript使用小技巧

1. 通过javascript将一个数组分为三类，添加到一个数组中

var  input  = ins1 = $("#t1 .td");    //取出一个htmld页面中的所有table中的td
_add = [
[],
[],
[]
];
console.log("111");
for (i = 0; i < input.length; i++) {
_add[i % 3].push($(input[i]));
}

2.

获取div左上角坐标

var x=document.getElementById("start").offsetLeft ;

var y=document.getElementById("start").offsetTop ;

获取屏幕宽高

var w = screen.width

var h = screen.height

获取点击位置坐标

var e = event || window.event;

var cx= e.clientX;

var cy= e.clientY;

document.body.clientWidth ==> BODY对象宽度

document.body.clientHeight
==> BODY对象高度

s += " 网页可见区域宽："+ document.body.clientWidth+"
";

s += " 网页可见区域高："+ document.body.clientHeight+" ";

s += " 网页可见区域宽："+ document.body.offsetWidth + " (包括边线和滚动条的宽)"+" ";

s += " 网页可见区域高："+ document.body.offsetHeight + " (包括边线的宽)"+" ";

s += " 网页正文全文宽："+ document.body.scrollWidth+" ";

s += " 网页正文全文高："+ document.body.scrollHeight+" ";

s += " 网页被卷去的高(ff)："+ document.body.scrollTop+" ";

s += " 网页被卷去的高(ie)："+ document.documentElement.scrollTop+" ";

s += " 网页被卷去的左："+ document.body.scrollLeft+" ";

s += " 网页正文部分上："+ window.screenTop+" ";

s += " 网页正文部分左："+ window.screenLeft+" ";

s += " 屏幕分辨率的高："+ window.screen.height+" ";

s += " 屏幕分辨率的宽："+ window.screen.width+" ";

s += " 屏幕可用工作区高度："+ window.screen.availHeight+" ";

s += " 屏幕可用工作区宽度："+ window.screen.availWidth+" ";

s += " 你的屏幕设置是 "+ window.screen.colorDepth +" 位彩色"+" ";

s += " 你的屏幕设置 "+ window.screen.deviceXDPI +" 像素/英寸"+" ";

s += " window的页面可视部分实际高度(ff) "+window.innerHeight+" ";

s += " 网页可见区域宽："+ document.body.clientWidth+" ";

s += " 网页可见区域高："+ document.body.clientHeight+" ";

s += " 网页可见区域宽："+ document.body.offsetWidth + " (包括边线和滚动条的宽)"+" ";

s += " 网页可见区域高："+ document.body.offsetHeight + " (包括边线的宽)"+" ";

s += " 网页正文全文宽："+ document.body.scrollWidth+" ";

s += " 网页正文全文高："+ document.body.scrollHeight+" ";

s += " 网页被卷去的高(ff)："+ document.body.scrollTop+" ";

s += " 网页被卷去的高(ie)："+ document.documentElement.scrollTop+" ";

s += " 网页被卷去的左："+ document.body.scrollLeft+" ";

s += " 网页正文部分上："+ window.screenTop+" ";

s += " 网页正文部分左："+ window.screenLeft+" ";

s += " 屏幕分辨率的高："+ window.screen.height+" ";

s += " 屏幕分辨率的宽："+ window.screen.width+" ";

s += " 屏幕可用工作区高度："+ window.screen.availHeight+" ";

s += " 屏幕可用工作区宽度："+ window.screen.availWidth+" ";

s += " 你的屏幕设置是 "+ window.screen.colorDepth +" 位彩色"+" ";

s += " 你的屏幕设置 "+ window.screen.deviceXDPI +" 像素/英寸"+" ";

s += " window的页面可视部分实际高度(ff) "+window.innerHeight+" ";