通過id查找單個元素

封裝方式：

//通過id查找單個元素
(function (document){
    //防止覆蓋
    var _overwrite = window._,
        _;

    _ = {
        $ : function(id){
            return typeof id === "string" ? document.getElementById(id) : id;
        }
    }

    //將_置為全局對象
    window._ = _;

})(document);

測試：

<!DOCTYPE html>
<html>
<body>
    <div id = "cloud">The cloud is beautiful</div>
</body>
<script><!--
(function (document){
    //防止覆蓋
    var _overwrite = window._,
        _;

    _ = {
        $ : function(id){
            return typeof id === "string" ? document.getElementById(id) : id;
        }
    }

    //將_置為全局對象
    window._ = _;

})(document);


var cloud = _.$("cloud");
alert(cloud.innerHTML); //The cloud is beautiful
--></script>
</html>

通過ID獲取多個元素

封裝方式：

//通過id查找一個或者多個元素
(function (document){
    //防止覆蓋
    var _overwrite = window._,
        _;
    _ = {
        $ : function(/*ids....*/){
            var elements = {},
                    id,
                    elt;
            for(var i = 0, len= arguments.length; i < len; i++){
                id = arguments[i];
                elt = document.getElementById(id);
                if(elt === null){
                    throw new Error("No element with id:" + id);
                }
                if(len === 1){
                    return elt;
                }
                elements[id] = elt;
            }
            return elements;        
        }
    }

    //將_置為全局對象
    window._ = _;

})(document);

測試：

 <div id = "cloud">The cloud is beautiful</div>
 <div id = "sea">The white white sea</div>
//獲取單個元素
var cloud = _.$("cloud");
alert(cloud.innerHTML);//The cloud is beautiful

//獲取多個元素
var all = _.$("cloud", "sea");
alert(all.cloud.innerHTML + "," + all.sea.innerHTML); //The cloud is beautiful,The white white sea

免責聲明！

本站轉載的文章為個人學習借鑒使用，本站對版權不負任何法律責任。如果侵犯了您的隱私權益，請聯系本站郵箱yoyou2525@163.com刪除。