Proxy.html

<!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" h-value='value' id="input"/>
    <p id="el" h-text='value'></p>
    <script>
        let elems = [document.getElementById('el'), document.getElementById('input')];
        // 定义Directive
        let directive = {
            value: function(val) {
                this.setAttribute('value', val);
            },
            text: function(val) {
                this.innerHTML = val;
            }
        }
        // 设置data访问的Proxy
        let data = new Proxy({}, {
            get: function(target, key, receive) {
                return target.value;
            },
            set: function(target, key, value, receive) {
                target.value = value;
                scan();
                return target.value;
            }
        });

        data['value'] = 'hello';
        scan();

        // 数据绑定监听
        elems[1].addEventListener('keyup', function(e) {
            data.value = e.target.value;
        }, false);

        setTimeout(() => {
            data.value = 'hello world';
        }, 1000);

        function scan() {
            for(let elem of elems) {
                elem.directive = [];
                for (let attr of elem.attributes) {
                    if (attr.nodeName.indexOf('h-') >= 0) {
                        // 调用指令
                        directive[attr.nodeName.slice(2)].call(elem, data[attr.nodeValue]);
                        elem.directive.push(attr.nodeName.slice(2));
                    }
                }
            }
        }
    </script>
</body>
</html>