JavaScript基础(8) BOM
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8.1 window对象
8.1.1 全局作用域
<script type="text/javascript"> var age = 29; window.color = "red"; //throws an error in IE < 9, returns false in all other browsers delete window.age; //throws an error in IE < 9, returns true in all other browsers delete window.color; //returns true alert(window.age); //29 alert(window.color); //undefined </script>
8.1.3 窗口位置
<script type="text/javascript"> var leftPos = (typeof window.screenLeft == "number") ? window.screenLeft : window.screenX; var topPos = (typeof window.screenTop == "number") ? window.screenTop : window.screenY; alert("Left: " + leftPos); alert("Top: " + topPos); </script>
8.1.5 导航与打开窗口
<script type="text/javascript"> var blocked = false; try { var wroxWin = window.open("http://www.wrox.com", "_blank"); if (wroxWin == null){ blocked = true; } } catch (ex){ blocked = true; } if (blocked){ alert("The popup was blocked!"); } </script>
8.1.6 间歇调用和超时调用
<script type="text/javascript"> var num = 0; var max = 100; function incrementNumber() { num++; //if the max has not been reached, set another timeout if (num < max) { setTimeout(incrementNumber, 500); } else { alert("Done"); } } setTimeout(incrementNumber, 500); </script>
8.1.7 系统对话框
8.2 location对象
8.2.1 查询字符串参数
<script type="text/javascript"> function getQueryStringArgs(){ //get query string without the initial ? var qs = (location.search.length > 0 ? location.search.substring(1) : ""), //object to hold data args = {}, //get individual items items = qs.length ? qs.split("&") : [], item = null, name = null, value = null, //used in for loop i = 0, len = items.length; //assign each item onto the args object for (i=0; i < len; i++){ item = items[i].split("="); name = decodeURIComponent(item[0]); value = decodeURIComponent(item[1]); if (name.length){ args[name] = value; } } return args; } //assume query string of ?q=javascript&num=10 var args = getQueryStringArgs(); alert(function(){return location.search;}()); alert(args["q"]); //"javascript" alert(args["num"]); //"10" </script>
8.2.2 位置操作
8.3 navigator对象
8.3.1检测插件
<script type="text/javascript">
//plugin detection - doesn't work in IE
function hasPlugin(name){
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;
}
//plugin detection for IE
function hasIEPlugin(name){
try {
new ActiveXObject(name);
return true;
} catch (ex){
return false;
}
}
//detect flash for all browsers
function hasFlash(){
var result = hasPlugin("Flash");
if (!result){
result = hasIEPlugin("ShockwaveFlash.ShockwaveFlash");
}
return result;
}
//detect quicktime for all browsers
function hasQuickTime(){
var result = hasPlugin("QuickTime");
if (!result){
result = hasIEPlugin("QuickTime.QuickTime");
}
return result;
}
//detect flash
alert(hasFlash());
//detect quicktime
alert(hasQuickTime());
</script>
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