体验性能
LeaferJS 可以让你拥有瞬间创建 100 万个图形的能力。经过更细颗粒的代码模块划分，在拥有高性能的同时，我们并没有牺牲掉代码的可维护性，预计将来还会有很大的性能提升空间。
创建速度
创建 100 万个可交互的矩形，首屏渲染最快仅需 1.5 秒。
比同类引擎快 10 倍左右。
内存占用
创建 100 万个可交互的矩形，仅占用 350M 内存。
比同类引擎节省 10 倍左右的内存。
体验代码
下面是可以创建 100 万个矩形的示例代码，可以直接复制使用。建议使用 Chrome 浏览器，通过控制台查看打印信息。
ts
import { Leafer, Group, Rect, Debug } from 'leafer-ui'
class RectsCase {
constructor(view: Group, num: number) {
let group: Group
const groupSize = 10 * 100 * 1.5
const column = num > 25 ? 10 : 5
for (let i = 0; i < num; i++) {
group = new Group()
group.x = groupSize * (i % column)
group.y = groupSize * Math.floor(i / column)
view.add(group)
this.createRects(group, 0, 0, `hsl(${i * 3},50%, 50%)`)
}
}
createRects(group: Group, startX: number, startY: number, color: string): void {
let y: number, rect: Rect
for (let i = 0; i < 100; i++) {
if (i % 10 === 0) startX += 10
y = startY
for (let j = 0; j < 100; j++) {
if (j % 10 === 0) y += 10
rect = new Rect(null)
rect.x = startX
rect.y = y
rect.height = 10
rect.width = 10
rect.fill = color
rect.draggable = true
group.add(rect)
y += 12
}
startX += 12
}
}
}
const startTime = Date.now()
const app = new Leafer({ view: window })
Debug.enable = true
Debug.filter = 'RunTime'
new RectsCase(app, 100) // 100万个
console.log(`创建100万个矩形用时：`, Date.now() - startTime, '毫秒')html
<!DOCTYPE html>
<html>
<head>
<title>Million Rects | Leafer UI</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<script src="https://unpkg.com/leafer-ui@1.0.9/dist/web.min.js"></script>
</head>
<body></body>
<script>
var Leafer = LeaferUI.Leafer
var Group = LeaferUI.Group
var Rect = LeaferUI.Rect
var Debug = LeaferUI.Debug
function createRects(view, num) {
var group
var groupSize = 10 * 100 * 1.5
var column = num > 25 ? 10 : 5
for (var i = 0; i < num; i++) {
group = new Group()
group.x = groupSize * (i % column)
group.y = groupSize * Math.floor(i / column)
view.add(group)
create10000(group, 0, 0, `hsl(${i * 3},50%, 50%)`)
}
}
function create10000(group, startX, startY, color) {
var y, rect
for (var i = 0; i < 100; i++) {
if (i % 10 === 0) startX += 10
y = startY
for (var j = 0; j < 100; j++) {
if (j % 10 === 0) y += 10
rect = new Rect()
rect.x = startX
rect.y = y
rect.height = 10
rect.width = 10
rect.fill = color
rect.draggable = true
group.add(rect)
y += 12
}
startX += 12
}
}
var startTime = Date.now()
var app = new Leafer({ view: window })
Debug.enable = true
Debug.filter = 'RunTime'
createRects(app, 100) // 100万个
console.log(`创建100万个矩形用时：`, Date.now() - startTime, '毫秒')
</script>
</html>