JS 获取getElementByName(root, tagName, objName)

    /**
     *在root对象范围内
     *查找所有的tagName标签中，
     *name属性为objName的所有标签
     */
    function getElementByName(root, tagName, objName) {
    
        if(!root) root = document;
         else if(typeof root == "string") root = document.getElementById(root);
        
        if(!tagName) tagName = "*";
        var allTags = root.getElementsByTagName(tagName);
        if(!objName) return allTags;
        
        var elements = [];
        
        for(var i=0; i<allTags.length; i++) {
            var tagObject = allTags[i];
            if(tagObject.name && (objName == tagObject.name)) {
                elements.push(tagObject);
            }
        }
        return elements;
    }