<body>
<input type="text" id="textInput"/>
输入：<span id="textSpan"></span>
<script>
var obj = {}
//1. Object.defineProperty()
Object.defineProperty(obj,'name', {
get: function() {
return name
},
set: function(v) {
console.log(v)
textSpan.innerHTML = v
name = v
}
})
textInput.onkeyup = function(e) {
obj.name = textInput.value
}
//2. Proxy()
var p = new Proxy(obj,{
get: (target, key) => {
return key in target ? target[key] : undefined
},
set:(target, key,value) => {
target[key] = value
textSpan.innerHTML = value
}
})
window.addEventListener("keyup",(e) => {
p.name = e.target.value
})
let arr = []
var p = new Proxy(arr,{
get: (target, key) => {
console.log('get')
return key in target ? target[key] : undefined
},
set:(target, key,value) => {
console.log('set',key)
target[key] = value
textSpan.innerHTML = value
console.log('set',target)
return true
}
})
window.addEventListener("keyup",(e) => {
// p[0]=e.target.value
p.push(e.target.value)
// console.log(p)
})
</script>
</body>
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