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在应用程序需要连接外部库的情况下，linux默认对库的连接是使用动态库，在找不到动态库的情况下再选择静态库。使用方式为： gcc test.cpp -L. -ltestlib 如果当前目录有两个库libtestlib.so libtestlib.a 则肯定是连接libtestlib.so。如果要指定为连接静态库则使用： gcc test.cpp -L. -static -ltestlib 使用静态库进行连接。 当对动态库与静态库混合连接的时候，使用-static会导致所有的库都使用静态连接的方式。这时需要作用-Wl的方式： gcc test.cpp -L. -Wl,-Bstatic -ltestlib -Wl,-Bdynamic -ltestdll 另外还要注意系统的运行库使用动态连接的方式，所以当动态库在静态库前面连接时，必须在命令行最后使用动态连接的命令才能正常连接 ，如： gcc test.cpp -L. -Wl,-Bdynamic -ltestdll -Wl,-Bstatic -ltestlib -Wl,-Bdynamic 最后的-Wl,-Bdynamic表示将缺省库链接模式恢复成动态链接。 其中用到的两个选项：-Wl,-Bstatic和-Wl,-Bdynamic。这两个选项是gcc的特殊选项，它会将选项的参数传递给链接器，作为链接器的选项。比如-Wl,

I have saw the compiler option GNU99 and C99. What's the difference of them? Any detail documentation? (Clang, Xcode, Mac OS X) Matt Joiner Differences between various standard modes clang supports the -std option, which changes what language mode clang uses. The supported modes for C are c89, gnu89, c94, c99, gnu99 and various aliases for those modes. If no -std option is specified, clang defaults to gnu99 mode. Differences between all c* and gnu* modes: c* modes define __STRICT_ANSI__ . Target-specific defines not prefixed by underscores, like "linux", are defined in gnu* modes. Trigraphs

I know the --verbose or -v from several tools and I'd like to implement this into some of my own scripts and tools. I thought of placing: if verbose: print ... through my source code, so that if a user passes the -v option, the variable verbose will be set to True and the text will be printed. Is this the right approach or is there a more common way? Addition: I am not asking for a way to implement the parsing of arguments. That I know how it is done. I am only interested specially in the verbose option. My suggestion is to use a function. But rather than putting the if in the function, which

原文: http://blog.gqylpy.com/gqy/239 目录 #. window对象介绍 #. window子对象 1. 浏览器对象 navigator 2. 屏幕对象 screen 3. 历史 history 4. 地址(URL) location 5. 弹出框 /. 警告框 alert /. 确认框 confirm /. 提示框 prompt 6. 计时相关 /. 一次性 setTimeout() /. 周期性 setInterval() #. DOM 1. 查找标签 document /. 直接查找 /. 间接查找 2. 节点操作 /. 创建节点 /. 添加节点 /. 删除节点 /. 替换节点 /. 属性节点 /. attribute 操作 3. 获取值操作 4. class 操作 5. 指定CSS属性 #. 事件 #. window对象介绍 JavaScript分为： ECMAScript 、DOM、BOM. BOM（Browser Object Model）是指浏览器对象模型，它使JavaScript有能力与浏览器进行"对话". DOM（Document Object Model）是指文档对象模型，通过它可以访问HTML文档的所有元素. window对象是客户端的JavaScript最高层对象之一，由于window对象是其它大部分对象的共同祖先

I have two <select> fields in my page. The first is shown below with some illustrative brand names: <select name="1"> <option value="Apple">Apple</option> <option value="Samsung">Samsung</option> <option value="other">Other</option> </select> If the user selects "Apple" in this first field, I would like the second to contain Apple's products for the user to choose from, such as <select name="Apple"> <option value="iphone">iPhone 7</option> <option value="ipad">iPad Super Pro</option> <option value="other">Other</option> </select> If it chooses "Samsung", however, I would like to update the

As usual, option elements are shown when a select element is clicked and I'd like to get the height of the option elements. Thanks. Edit @david old school select <select> <option>a</option> <option>s</option> </select> I believe this is what you want $(document).ready(function () { $("#mySelect").change(function () { alert($(this.options[this.selectedIndex]).height()); }); }); Here is a demo http://jsfiddle.net/xf3wD/ That's not possible, as it's actually not the option elements that are shown. The HTML standard only specifies that the browser should provide some way of choosing from the

How do I retain whatever was selected from the dropdown even after page refresh so user knows what he/she selected using jquery? or javascript? <select id="hospitalDropDown" onchange="window.open(this.options[this.selectedIndex].value,'_top')"> <option disabled="disabled">Select Hospital</option> <option value="http://mysite.com/events/Pages/default1.aspx">All Hospitals</option> <option value="http://mysite.com/events/Pages/default1.aspx?hos=Dyer">Dyer</option> <option value="http://mysite.com/events/Pages/default1.aspx?hos=Carmel">Carmel</option> </select> Try this: <select id=

In woocommerce, I am using the following code to display an input text field on admin product edit pages, that allow me to add an additonal pricing option to the product: add_action( 'woocommerce_product_options_pricing', 'wc_cost_product_field' ); function wc_cost_product_field() { woocommerce_wp_text_input( array( 'id' => 'repair_price', 'class' => 'wc_input_price short', 'label' => __( 'Repair Cost', 'woocommerce' ) . ' (' . get_woocommerce_currency_symbol() . ')' ) ); } add_action( 'save_post', 'wc_cost_save_product' ); function wc_cost_save_product( $product_id ) { // stop the quick edit

Okay, let's start with an example. Keep in mind, this is only an example. <select id = "selection1"> <option value = "1" id = "1">Number 1</option> <option value = "2" id = "2">Number 2</option> <option value = "3" id = "3">Number 3</option> </select> Now from here, we have a dropdown with 3 options. What I want to do now is to hide an option. Adding style = "display:none" will not help. The option would not appear in the dropdownlist, but using the arrow keys, you can still select it. Essentially, it does exactly what the code says. It isn't displayed, and it stops there. A JQuery function of

Using the JQuery :contains function to decide which option on a select is selected from a SESSION variable. The contains function is matching the wrong option as their is an option 'PADI Open Water' and another 'PADI Open Water Scuba Instructor' How do we limit it to match the exact content and no more? $('option:contains("<?php echo $_SESSION['divelevel'];?>")').attr('selected', 'selected'); Try using .filter() , to find the option you want. $('option').filter(function(){ return $(this).html() == "<?php echo $_SESSION['divelevel'];?>"; }).attr('selected', 'selected'); Rocket Hazmat's answer