JS原生数据双向绑定实现代码

时间：2021-05-26

代码如下：

<span style="font-family:Times New Roman;font-size:14px;" deep="7"><!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Demo</title> <script> function DataBinder( object_id ) { // Create a simple PubSub object var pubSub = { callbacks: {}, on: function( msg, callback ) { this.callbacks[ msg ] = this.callbacks[ msg ] || []; this.callbacks[ msg ].push( callback ); }, publish: function( msg ) { this.callbacks[ msg ] = this.callbacks[ msg ] || []; for ( var i = 0, len = this.callbacks[ msg ].length; i < len; i++ ) { this.callbacks[ msg ][ i ].apply( this, arguments ); } } }, data_attr = "bind-" + object_id, message = object_id + ":input", timeIn; changeHandler = function( evt ) { var target = evt.target || evt.srcElement, // IE8 compatibility prop_name = target.getAttribute( data_attr ); if ( prop_name && prop_name !== "" ) { clearTimeout(timeIn); timeIn = setTimeout(function(){ pubSub.publish( message, prop_name, target.value ); },50); } }; // Listen to change events and proxy to PubSub if ( document.addEventListener ) { document.addEventListener( "input", changeHandler, false ); } else { // IE8 uses attachEvent instead of addEventListener document.attachEvent( "oninput", changeHandler ); } // PubSub propagates changes to all bound elements pubSub.on( message, function( evt, prop_name, new_val ) { var elements = document.querySelectorAll("[" + data_attr + "=" + prop_name + "]"), tag_name; for ( var i = 0, len = elements.length; i < len; i++ ) { tag_name = elements[ i ].tagName.toLowerCase(); if ( tag_name === "input" || tag_name === "textarea" || tag_name === "select" ) { elements[ i ].value = new_val; } else { elements[ i ].innerHTML = new_val; } } }); return pubSub; } function DBind( uid ) { var binder = new DataBinder( uid ), user = { // ... attributes: {}, set: function( attr_name, val ) { this.attributes[ attr_name ] = val; // Use the `publish` method binder.publish( uid + ":input", attr_name, val, this ); }, get: function( attr_name ) { return this.attributes[ attr_name ]; }, _binder: binder }; // Subscribe to the PubSub binder.on( uid + ":input", function( evt, attr_name, new_val, initiator ) { if ( initiator !== user ) { user.set( attr_name, new_val ); } }); return user; } </script> </head> <body> <input type="text" bind-1="name" /> <span bind-1="name"></span> <script> var DBind = new DBind( 1 ); DBind.set( "name", "" ); </script> </body> </html></span>

效果示例：

总结

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