一、強行綁定
<!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>
<script src="./vue.js"></script>
</head>
<body>
<input id="ipt" />
<p id="p"></p>
<script>
//代碼演示：defineProperty的雙向綁定
var obj = {};
Object.defineProperty(obj, 'val', {
set: function (newVal) {
document.getElementById("ipt").value = newVal == undefined ? '' : newVal;
document.getElementById("p").innerHTML = newVal == undefined ? '' : newVal;
}
});
document.getElementById("ipt").addEventListener("input", function (e) {
obj.val = e.target.value;
})
</script>
</body>
</html>
二、簡單的雙向綁定演示
<!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>
<script src="./vue.js"></script>
</head>
<body>
<input zl-model="val" />
<p zl-model="val"></p>
<script>
//代碼演示：defineProperty的雙向綁定
var obj = {};
Object.defineProperty(obj, 'val', {
set: function (newVal) {
var list = document.querySelectorAll("[zl-model=val]");
for (let i = 0; i < list.length; i++) {
if (list[i].nodeName == "INPUT") list[i].value = newVal == undefined ? '' : newVal;
else list[i].innerHTML = newVal == undefined ? '' : newVal;
}
},
get: function () {
return document.querySelector("[zl-model=val]").value;
}
});
document.querySelector("[zl-model=val]").addEventListener("keydown", function (e) {
obj.val = e.target.value;
})
</script>
</body>
</html>