How to implement one-way binding in js (code attached)
This article mainly introduces how to implement one-way binding in js (with code). It has certain reference value. Now I share it with you. Friends in need can refer to it
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<input type="text" id="a">
<span id="b"></span>
<script>
// var obj = {};
// Object.defineProperty(obj,"hello",{
// set: () => {
// console.log("get方法被调用");
// },
// get: (val) => {
// console.log("se方法被调用"+val);
// }
// })
let obj = {};
//Object.defineProperty(obj, prop, descriptor)
// obj 要在其上定义属性的对象。
// prop 要定义或修改的属性的名称。
// descriptor 将被定义或修改的属性描述符。
Object.defineProperty(obj, 'hello', { //这里定义obj.hello为完成修改的属性
set: (newVal) => { //当obj.hello的属性发生变化,就会以参数传进来
document.getElementById('a').value = newVal; //set触发给a值同时把值给b实现绑定
document.getElementById('b').innerHTML = newVal;
obj.hello
},
get: ()=> {
console.log("hahahaah");
}
});
//addEventListener() 方法用于向指定元素添加事件句柄。
//element.addEventListener(event, function, useCapture)
//event 所有 HTML DOM 事件
//function 指定事件触发时执行的函数。
//useCapture 指定事件是否在捕获或冒泡阶段执行。
document.addEventListener('keyup', (e) => { //监听键盘的按键松开的事件
console.log(e);
obj.hello = e.target.value; //将监听到了变化的值给obj.hello,让他触发set属性
})
</script>
</body>
</html>Related recommendations:
How to implement two-way data binding in js
Detailed explanation of two-way binding in vue.js
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