一个简单的创建dom的函数

var  regName = /^(div|a|p|ul|li|input|select|document|body|iframe)$/;
function createDom(name, obj) {
        var match = regName.exec(name),
          dom;
        if (match && match[1]) {
            dom = document.createElement(match[1]);
        }
        if (dom.nodeType && dom.nodeType == 1) {
            for (var i in obj) {
                var match = i.split(/\./);
                var len = match && match.length || 0;
                if (len == 1) {
                    dom[match[0]] = obj[i];
                } else if (len == 2) {
                    dom.style[match[1]] = obj[i];
                }
            }
        }
        return dom;
    }

调用方法示例

  var newdom = createDom("input", {
                        "className": "alertInput data",
                        "type": "text",
                        "value":"123",
                        "style.width":"100px"
                    });

createDom("div", {
                "className": "_div",
                "id": "test",
                "style.cssText": "margin:0;padding:0;position:fixed;top:0;left:0"
            })