相关疑难解决方法(0)

假设我创建一个对象如下:

var myObject = {
    "ircEvent": "PRIVMSG",
    "method": "newURI",
    "regex": "^http://.*"
};

什么是去除财产的最好方式regex与新落得myObject如下？

var myObject = {
    "ircEvent": "PRIVMSG",
    "method": "newURI"
};

在下面的代码中,我在选择框上设置了一个更改处理程序,以根据选择的值显示和隐藏一些后续问题.

此外,对于选择的某些值,显示了额外的消息.

为了检查我是否需要隐藏额外的消息,我保留了一个名为Previous的变量.执行处理程序后,我检查Previous是否为null或者大小是否为0.

将Previous更新为一个空的JQuery对象会很好,这样就不必对null进行额外的检查.

执行$()会返回大小为1的对象.

有没有办法创建一个空的Jquery对象？

//Init function.
$(function(){
//Hold the previously selected object for the account type selection.

var Previous = null;  //Here is where I would like to initialize.
                      //something like Previous = $();


$("SELECT[name='AccountType']").change(
    function () {
        //Hide Previous message if there was one.
        if(Previous == null || Previous.size() > 0){ 
            Previous.hide();
        }

        //Show the message if found and save it as previous.
        Previous = $("#"+this.value+"_Msg").show();

        //Get fisrt question
        var FirstQuestion = $(".FirstQuestion");
        if(this.value === ''){
            FirstQuestion.hide();
        }else{ …