Two-way data binding interviews generally ask questions. First, you must understand the usage of accessor attributes and time relationships. Paste the code first and analyze it when you have time. I hope this article can help everyone.
Object.defineProperty(obj,propertyName,{ get:function(){ //读取obj对象的propertyName属性时执行 }, set:function(currvalue){ //修改obj对象的propertyName属性时执行 }, });
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>js实现vue双向数据绑定 利用访问器属性</title></head><body> <input bind-value="value" type="text" placeholder="请输入..." id="user-input"> <p bind-text="value" id="show-input"></p> <script> var elems=[document.getElementById('user-input'),document.getElementById('show-input')]; var data={ initValue:'', }; function define(obj,propertyName) { Object.defineProperty(obj,propertyName,{ get:function(){ return this.initValue; }, set:function(currvalue){ this.initValue=currvalue; //同步p scan(); }, }); } define(data,'value'); data.value=''; scan(); //监听事件 elems[0].addEventListener('keyup',function(e){ var e=e||window.event; data.value=e.target.value; }); function scan(){ for(var i=0;i<elems.length;i++){ var ele=elems[i]; for(var j=0;j<ele.attributes.length;j++){ var attr=ele.attributes[j]; if(attr.nodeName.indexOf('bind')>=0){ elems[1].innerHTML=data.value; elems[0].setAttribute('current-values',data.value); } } } } </script></body></html>
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