form表单回车Enter不直接提交，类似tab切换

<input> 控件增加onkeypress事件

onkeypress="return handleEnter(this, event)"

JS如下：

 var keyCode = event.keyCode ? event.keyCode : event.which ? event.which
 : event.charCode;
if (keyCode == 13) {
 var i;
 for (i = 0; i < field.form.elements.length; i++)
 if (field == field.form.elements[i])
 break;
 i = (i + 1) % field.form.elements.length;
 field.form.elements[i].focus();
 return false;
} else
 return true;

JQuery版：

                $("input").keypress(function (e) {

                    var keyCode = e.keyCode ? e.keyCode : e.which ? e.which : e.charCode;

                    if (keyCode == 13) {

                        var i;

                        for (i = 0; i < this.form.elements.length; i++)

                            if (this == this.form.elements[i])

                                break;

                        i = (i + 1) % this.form.elements.length;

                        this.form.elements[i].focus();

                        return false;

                    }

                    else

                        return true;

                });