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js simple two-way binding case code

小云云
小云云Original
2018-03-14 18:02:551360browse

This article mainly shares with you the js simple two-way binding case code. Just copy the code into the page and run it to see the effect. I hope it can help everyone. 

<span style="font-size: 14px;"><!DOCTYPE html><html lang="en"><head><br/>    <meta charset="UTF-8"><br/>    <title>Title</title></head><body><input type="text" id="myinput" ><script><br/>    function watch(obj,key,callback) {<br/>        var old = obj[key];        Object.defineProperty(obj,key,{<br/>            set:function(val){<br/>                var oldVal = old;<br/>                old = val;<br/>                callback(val,oldVal,this);<br/>            },<br/>            get:function(){<br/>                return old;<br/>            }<br/>        });<br/>    }    var input = document.getElementById("myinput");    var obj = {};<br/>    watch(obj, "input",function (val) {<br/>        input.value = val;<br/>        console.log("这里是不管view层，还是module层修改后的回调，最后设置的值是"+val);<br/>    });<br/><br/>    input.onkeyup = function () {<br/>        obj.input = input.value;<br/>    };</script></body></html><br/></span>

Code test

  • If you modify the value in the input, you will see the new value printed out on the console

  • Modify the value of obj.input in the console, the value in the input box will also change accordingly, and the event will be triggered to obtain the new value

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