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BOM.html
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BOM.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>BOM</title>
</head>
<body>
BOM--->浏览器的一个实例，它的核心对象是 window...
<br />
window--->JavaScript 访问浏览器窗口的接口，是 ECMAScript 定义的 Global
对象...
</body>
<script>
var variableSample = 8888;
console.log(window.variableSample); // 8888
window.hahasha = 6666;
delete variableSample;
delete hahasha;
try {
console.log(variableSample);
} catch (error) {
console.log(error);
}
try {
console.log(hahasha);
} catch (error) {
console.log(
'全局变量不能通过 delete 操作符删除，而直接在 window 对象上的定义的属性可以被删除...'
);
console.log('原因是全局变量的 configurable 属性为 false...');
}
try {
// 这里会抛出错误，因为 oldValue 未定义
var newValue = oldValue;
console.log(newValue);
} catch (error) {
// 这里不会抛出错误，因为这是一次属性查询
// newValue 的值是 undefined
var newValue = window.oldValue;
console.log(newValue);
} finally {
console.log(
'尝试访问未声明的变量会抛出错误，但是通过查询 window 对象，可以知道某个可能未声明的变量是否存在...'
);
}
var winLeftPos = window.screenLeft || window.screenX;
var winTopPos = window.screenTop || window.screenY;
console.log(winLeftPos, winTopPos); // 0 0
// 在 mac 下好像被禁用了
window.moveBy(100, 100);
window.moveTo(100, 100);
window.resizeBy(100, 100);
window.resizeTo(100, 100);
// window.open(要加载的 URL、窗口目标、一个特性字符串、一个表示新页面是否取代浏览器历史记录中当前加载页面的布尔值);
var baiduWindow = window.open(
'https://www.baidu.com/',
'Baidu',
'height=400,width=400,top=10,left=10,resizable=yes',
false
);
if (baiduWindow == null) {
alert('The popup is blocked...');
} else {
console.log(baiduWindow);
}
setTimeout(function () {
console.log(baiduWindow.opener);
// 将 opener 置为 null，切断了当前窗口与新打开窗口之间的联系，所以 close() 方法报错
baiduWindow.opener = null;
try {
baiduWindow.close();
} catch (e) {
console.log(e);
}
console.log(baiduWindow.closed);
}, 6666);
// var answers = confirm('Do You Love Me ?');
// if (answers) {
// alert('Thank You');
// } else {
// alert('Fucking Asshole');
// }
var textIn = prompt('Who Are You ?', 'vkx');
if (textIn) {
alert('Welcome, ' + textIn);
}
// window.print();// 打印弹出框，出现打印预览界面
// window.find();
console.log(window.location === document.location);
console.log(location);
console.log([1, 2, 3].includes(1)); // ES2016
/*
window.location = "https://baidu.com" 或 location.href = "https://baidu.com" 是通过 assign 方法运行的...
location.assign('https://baidu.com');
location.reload();// 可能从缓存中重载页面
location.raload(true);// 从服务器重载页面
*/
navigator.plugins.refresh(); // 刷新浏览器插件列表
console.log(window.screen);
window.screen.orientation.onchange = function () {
console.log(this); // ScreenOrientation
if (this.type.indexOf('landscape') != -1) {
console.log('横屏');
} else {
console.log('竖屏');
}
};
window.resizeTo(screen.availWidth, screen.availHeight);
/*
history.go()
history.forward()
history.back()
history.length
*/
console.log(history.length);
console.log(document.createDocumentFragment);
</script>
</html>