在IQ Option中使用趋势级别信号策略进行交易

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Modify Select So Only The First One Is Gray

I have a select element and am using the first option as the title of the select field. I am wondering if there is a way 在IQ Option中使用趋势级别信号策略进行交易 to gray out the text inside the select field when the first option is 在IQ Option中使用趋势级别信号策略进行交易 selected. Can this only be done in JS, or is there a CSS solution?

I have tried changing the style of the first option but that only changes the colour of the text when I activate the dropdown menu.

5 Answers 5

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Here is a more modern solution so it's not specific to the first option, but rather an invalid option and requires no JS to show only the title/placeholder option as grey whereas the rest appear normal.

The :invalid selector on the select only works on an option if the select box is required, and the selected option's value 在IQ Option中使用趋势级别信号策略进行交易 is empty, so you can style it as you would a text box's placeholder text.

Setting it to disabled prevents the user from selecting it in the select options, and setting it to hidden hides it from the select options.

Here is my CodePen demo that explores additional select box styles and shows this one in action on a light background.

5G基站君的进化之路—eCPRI

基站君一直在默默地为我们服务

奋斗的基站君

二、分布式基站的崛起，CPRI接口的辉煌

2G和3G初期的基站君

1.天线：高高地挂在塔上。它也必须高挂在塔上，这是因为发射信号的需要。

2.机房：在塔下，必然有一个小房子，里面放着基站。

3.基站：就是发射无线信号的设备。基站在逻辑上分为BBU和RRU两部分。RRU负责信号收发，BBU负责信号处理。

4.馈线：连接天线和基站的，就是馈线了，这是一根又粗又硬又重的传输信号的管子。由于铁塔一般情况下有个几十米到100米高，所以这根管子也得几十到100米长。然而信号的传送是有损耗的，馈线越长损耗越大，可能从基站到天线，信号还没发出去就已经损耗掉了一多半。因此塔下的基站必须加大功率发射才能弥补这个损耗。

各种型号的馈线，塔越高，线越粗

5.在IQ Option中使用趋势级别信号策略进行交易在IQ Option中使用趋势级别信号策略进行交易配套设备。这些设备在图里没有画出，主要包含这些：电源，电池，空调。电源自不用说，基站得有电才能工作；万一停电了咋办？那得有电池撑着；另外，基站，电源，电池，这些设备挤在一个小房子里，不断发热温度升高，为了保证设备正常运行，得有空调降温才行。