Dont Wong shellphon

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

自定义emmet模板

问题复现

ST(Sublime Text)安装emmet插件后，输入!，按tab键就可以快速得到一个简易的html5模板，甚是便捷：

<!DOCTYPE html>
<html lang="en">
<head>

Plain Strings (207): foo
Anchors (208): k$
Ranges (202): ^[a-f]*$
Backrefs (201): (...).*\1
Abba (169): ^(.(?!(ll|ss|mm|rr|tt|ff|cc|bb)))*$|^n|ef
A man, a plan (177): ^(.)[^p].*\1$
Prime (286): ^(?!(..+)\1+$)
Four (199): (.)(.\1){3}
Order (198): ^[^o].....?$
Triples (507): (^39|^44)|(^([0369]|([147][0369]*[258])|(([258]|[147][0369]*[147])([0369]*|[258][0369]*[147])([147]|[258][0369]*[258])))*$)

	import { Component, OnInit, OnDestroy } from '@angular/core';
	import {Http} from "@angular/http";
	import { LocalCacheService } from "./local-cache.service";

	@Component({
	selector: 'app-example',
	templateUrl: './app.component.html',
	styleUrls: ['./app.component.scss']
	})
	export class ExampleComponent implements OnInit, OnDestroy {

	# Compiled source #
	###################
	*.com
	*.class
	*.dll
	*.exe
	*.o
	*.so

	# Packages #

	var a = [];

	a[Math.pow(2, 32) - 2] = "max index"; // highest non-expando indexed property
	console.log(a.length === Math.pow(2, 32) - 1); // true

	try {
	a.push("whoa", "EVEN MOAR WHOA");
	} catch (e) {
	console.log(e instanceof RangeError); // true
	}