《JavaScript高级程序设计2》学习笔记——BOM

var leftPos = (typeof window.screenLeft == "number") ? window.screenLeft : window.screenX;
var topPos = (typeof window.screenTop == "number") ? window.screenTop : window.screenY;
//alert(leftPos + "," + topPos);
//alert(top.screenX);
window.moveTo(0, 0);
window.moveBy(100, 100);


var pageWidth = window.innerWidth;
var pageHeight = window.innerHeight;
if(typeof pageWidth != "number") {
    if(document.compatMode == "CSS1Compat") {
        pageWidth = document.documentElement.clientWidth;
        pageHeight = document.documentElement.clientHeight;
    } else {
        pageWidth = document.body.clientWidth;
        pageHeight = document.body.clientHeight;
    }
}
//document.write("pageWidth : " + pageWidth + " , " + "pageHeight : " + pageHeight);
window.resizeTo(500,500);//调整到500 X 500
window.resizeBy(100,50);//调整到600 X 550


window.open("http://ce.sysu.edu.cn/", "_blank");
var ceWin = window.open("http://ce.sysu.edu.cn/", "_blank", "height:400,width:400,top:10,left:10,resizable=yes,status=yes");
alert(ceWin.opener == window);
if(ceWin == null) {
    alert("The popup was blocked.");
}
//检测window.onen()方法打开的窗口是否被屏蔽了
var blocked = false;
try {
    var ceWin = window.open("http://ce.sysu.edu.cn/", "_blank", "height:400,width:400,top:10,left:10,resizable=yes,status=yes");
    if(ceWin == null) {
        blocked = true;
    }
} catch (ex) {
    blocked = true;
}
if(blocked) {
    alert("The popup was blocked.");
}

setTimeout(function() {
    alert("Hello!");
}, 1000);
var timeoutId = setTimeout(function() {
    alert("Hello!");
}, 2000);
clearTimeout(timeoutId);
setInterval(function() {
    alert("Hello!");
}, 1000);
//间歇调用
var num = 0;
var max = 5;
var intervalId = null;
function incrementNumber() {
    num ++;
    if(num == max) {
        clearInterval(intervalId);
        alert("Done!");
    }
}
intervalId = setInterval(incrementNumber, 500);
//超时调用
var num = 0
var max = 5;
function incrementNumber() {
    num ++;
    if(num < max) {
        setTimeout(incrementNumber, 500);
    } else {
        alert("Done!");
    }
}
setTimeout(incrementNumber, 500);

function getQueryStringArgs() {
    var qs = (location.search.length > 0) ? location.search.subString(1) : "";
    var args = {};
    var value = null, name = null, item = null;
    var items = qs.split("&");
    for(var i=0, len=items.length; i<len; i++) {
        item = items[i].split("=");
        name = decodeURIComponent(item[0]);
        value = decodeURIComponent(item[1]);
        args[name] = value;
    }
    return args;
}

alert(navigator.appCodeName);//Mozilla
//alert(navigator.appName);
alert(navigator.cookieEnabled);//true
alert(navigator.cpuClass);//x86
alert(navigator.language);//zh-cn
alert(navigator.onLine);//false
alert(navigator.platform);//Win32
alert(navigator.plugins);//
alert(navigator.product);//
alert(navigator.systemLanguage);//zh-cn
alert(navigator.userLanguage);//zh-cn
function hasPlugin(name) {//非IE中检测插件
    name = name.toLowerCase();
    for(var i=0; i<navigator.plugins.length; i++) {
        if(navigator.plugins[i].name.toLowerCase().indexOf(name) > -1)  {
            return true;
        }
    }
    return false;
}
alert(hasPlugin("Flash"));
alert(hasPlugin("Java"));*/
function hasIEPlugin(name) {
    try{
        new ActiveXObject(name);
        return true;
    } catch(ex) {
        return false;
    }
}
alert(hasIEPlugin("ShockwaveFlash.ShockwaveFlash"));