用来演示reactjs源码的仓库,一步步实现reactjs的核心功能。
reactjs是目前比较火的前端框架,但是目前并没有很好的解释原理的项目。reactjs源码比较复杂不适合初学者去学习。所以本文通过实现一套简易版的reactjs,使得理解原理更加容易。包括:
用来演示reactjs源码的仓库,一步步实现reactjs的核心功能。
用来演示reactjs源码的仓库,一步步实现reactjs的核心功能。
reactjs是目前比较火的前端框架,但是目前并没有很好的解释原理的项目。reactjs源码比较复杂不适合初学者去学习。所以本文通过实现一套简易版的reactjs,使得理解原理更加容易。包括:
代码中的
this._instantiateReactComponent()未定义。
全局有一个instantiateReactComponent()函数。
这两个是同一个吗?
ReactCompositeComponent.prototype.receiveComponent = function(nextElement, newState) {
......
if (_shouldUpdateReactComponent(prevRenderedElement, nextRenderedElement)) {
........
} else {
........
//重新new一个对应的component,
this._renderedComponent = this._instantiateReactComponent(nextRenderedElement);
........
}
}
👍
this._instantiateReactComponent是全局的instantiateReactComponent方法吗
我尝试了很多,比如设 state 中 current 为 1 时,显示的是 HelloMessage2 在前,
用点击事件触发 setState 来控制 current,current 为 2 时,显示的是 HelloMessage2 在后
然而只能得到两个 "REMOVE_NODE" 和两个 "INSERT_MARKUP" 类型的 updates
但是按理说,HelloMessage2 应该被移动才对,TYPE 为 MOVE_EXISTING
简单来说我就是找不到 MOVE_EXISTING 的例子。。
`var HelloMessage2 = React.createClass({
render: function() {
return React.createElement("div", null, "112122");
}
})
var HelloMessage = React.createClass({
getInitialState: function() {
return {
type: 'say:',
current: 1,
lists: ["1", "2", "3"]
};
},
changeType: function() {
if (this.state.current === 1) {
this.setState({
type: 'shout:',
current: 2,
lists: ["2", "3", "1"],
})
this.props.name = '我已经被异步更新了,由于我使用了lastindex,所以大部分节点不需要被删除'
} else {
this.setState({
type: 'say:',
current: 1,
lists: [1, 2, 3],
})
this.props.name = "";
}
},
render: function() {
var createItem = function(itemText) {
return React.createElement("div", null, itemText);
};
var element = this.state.current === 1 ? [React.createElement(HelloMessage2), this.state.type] : [React.createElement("div", null, this.state.type), React.createElement(HelloMessage2)];
// var change_elements = this.state.current === 1 ? [React.createElement("div", null, "Hello "), React.createElement("div", null, this.props.name)] : [React.createElement("div", null, this.props.name), React.createElement("div", null, "Hello ")]
// var elements = [].concat(element, this.state.lists.map(createItem));
// var elements = [].concat(element, React.createElement("div", null, this.state.lists))
return React.createElement("div", {
onclick: this.changeType.bind(this)
}, element);
}
});
React.render(React.createElement(HelloMessage,{
name: "John"
}), document.getElementById("container"));`
感谢大神的分享,感觉受益匪浅
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