Virtual DOMJavaScript DOM 模型
Virtual DOM 是一个 JavaScript DOM 模型,支持元素创建,区别计算和分支操作,提供高效的渲染。
代码示例
var h = require('virtual-dom/h');
var diff = require('virtual-dom/diff');
var patch = require('virtual-dom/patch');
var createElement = require('virtual-dom/create-element');
// 1: Create a function that declares what the DOM should look like
function render(count) {
return h('div', {
style: {
textAlign: 'center',
lineHeight: (100 + count) + 'px',
border: '1px solid red',
width: (100 + count) + 'px',
height: (100 + count) + 'px'
}
}, [String(count)]);
}
// 2: Initialise the document
var count = 0; // We need some app data. Here we just store a count.
var tree = render(count); // We need an initial tree
var rootNode = createElement(tree); // Create an initial root DOM node ...
document.body.appendChild(rootNode); // ... and it should be in the document
// 3: Wire up the update logic
setInterval(function () {
count++;
var newTree = render(count);
var patches = diff(tree, newTree);
rootNode = patch(rootNode, patches);
tree = newTree;
}, 1000);评论
