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observer.html
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observer.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div id="container"></div>
<script>
function Observer(target){
// var o = {}
// const props = Object.keys(target)
// for (const prop of props) {
// Object.defineProperty(o, prop, {
// get(){
// return target[prop]
// },
// set(val){
// target[prop] = val
// render();
// },
// enumerable: true
// })
// }
const proxy = new Proxy(target,{
set(target,key,value){
Reflect.set(target,key,value)
render()
},
get(target,key){
Reflect.get(target,key)
}
})
render();
function render(){
let html = '';
for (const prop of Object.keys(target)) {
html += `<p><span>${prop}</span>:<span>${target[prop]}</span></p>`
}
container.innerHTML = html;
}
return proxy;
}
const target = {
a: 1,
b: 2
}
const obj = Observer(target)
</script>
</body>
</html>