>通过window.MutationObserver对象实现简单的nextTick
function nextTick(callback,ctx){
let counter = 0
let textNode = document.createTextNode(String(counter));
let fn = ctx ? callback.bind(ctx) : callback;
let watcher = new window.MutationObserver(fn);
let options ={
characterData : true
}
watcher.observe(textNode,options)
counter++;
textNode.data = String(counter)
};
//--测试
let name = 'dufu'
let person = {
name : 'libai',
show(){
console.log(this.name)
}
};
nextTick(person.show,person);
console.log('1');
