Comments (4)
在componentDidMount钩子中执行setState不会触发 componentWillChange,也不会引发死循环
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官方react
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通过列队机制保证它与官方一致
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function fireMount() {
var queue = mounts;
if (!mounts.length) return;
mounts = [];
queue.forEach(function(el) {
if (typeof el === "function") {
el();
return;
}
if (el._pendingCallbacks.length) {
//willMount添加的回调
el._pendingCallbacks.forEach(function(fn) {
fn.call(el);
});
el._pendingCallbacks.length = 0;
}
if (el.componentDidMount) {
var instance = el;
var hook = instance.componentDidMount;
instance.componentDidMount = NaN;
instance._disabled = true;
hook.call(instance);
instance._disabled = false;
if (instance._pendingStates.length)
if (!instance._dirty) {
//DidMount 添加的回调
instance._dirty = true;
setTimeout(function() {
instance._dirty = false;
console.log(instance._rendered._hostNode, "-----3333");
reRenderComponent(instance);
instance._pendingCallbacks.forEach(function(fn) {
fn.call(instance);
});
instance._pendingCallbacks.length = 0;
});
}
}
});
}
废弃transaction对象
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