JS按钮事件问题

Question

本帖最后由 helifengwell 于 2011-11-30 00:16:59 编辑

Answer 1

                            <img alt="help" align="middle" src="<c:path/>wen.gif" style="cursor: help;" onmouseout="showOrHiddenHelpContent('hidden')" onclick="showOrHiddenHelpContent('show');"/>
                                                        <script language="javascript">
                                 var num=0;
                                //对帮助层的显示隐藏进行控制
                                function showOrHiddenHelpContent(identify)
                                {
                                    if (num== 0)
                                    {
                                        document.getElementById("helpContent").style.visibility = "visible";num=1;
                                    }
                                    else
                                    {  
                                        document.getElementById("helpContent").style.visibility = "hidden";num=0;
                                    }
                                }
                            </script>
                                                    </td>
                    </tr>
                    <tr>
                        <td align="left" style="font-size:8pt; color:#FF0000;">
                            <div id="helpContent" style="width:100%;visibility:hidden;">
                                <c:message key="magent.hotline.mClient.helpContent" />
                            </div>
                        </td>
                    </tr>    -->

Answer 2

将JS移到div下方<img alt="help" align="middle" src="baibai.jpg" style="cursor: help;" onmouseout="showOrHiddenHelpContent('hidden')" onclick="showOrHiddenHelpContent('show');"/>
                            <div  id="helpContent" style="width:100%; height:90px; background:Blue; visibility:hidden">
                                <c:message key="magent.hotline.mClient.helpContent" />
                            </div>
                                                        <script language="javascript">
                                                            //对帮助层的显示隐藏进行控制
                                                            function showOrHiddenHelpContent(identify) {
                                                                if (identify == "show") {
                                                                    document.getElementById("helpContent").style.visibility = "visible";
                                                                }
                                                                else {
                                                                    document.getElementById("helpContent").style.visibility = "hidden";
                                                                }
                                                            }
                            </script>

Answer 3

用个变量控制显示和隐藏<img alt="help" align="middle" src="<c:path/>wen.gif" style="cursor: help;" onclick="showOrHiddenHelpContent();"/>
                                                        <script language="javascript">
                                var isShow = false;
                                //对帮助层的显示隐藏进行控制
                                function showOrHiddenHelpContent()
                                {
                                    if (isShow)
                                    {
                                        document.getElementById("helpContent").style.visibility = "hidden";
                                        isShow = false;
                                    }
                                    else
                                    {
                                        document.getElementById("helpContent").style.visibility = "visible";
                                        isShow = true;
                                    }
                                }
                            </script>
                                                    </td>
                    </tr>
                    <tr>
                        <td align="left" style="font-size:8pt; color:#FF0000;">
                            <div id="helpContent" style="width:100%;visibility:hidden;">
                                <c:message key="magent.hotline.mClient.helpContent" />
                            </div>
                        </td>
                    </tr> 

Answer 4

<img alt="help" align="middle" src="<c:path/>wen.gif" style="cursor: help;" onclick="showOrHiddenHelpContent();"/>
<script language="javascript">
function showOrHiddenHelpContent() {
var helpContent=document.getElementById("helpContent");
helpContent.style.visibility =helpContent.style.visibility== "visible"?"hidden":"visible";
}
</script>
</td>
</tr>
<tr>
<td align="left" style="font-size:8pt; color:#FF0000;">
<div id="helpContent" style="width:100%;visibility:hidden;">
<c:message key="magent.hotline.mClient.helpContent" />
</div>
</td>
</tr>

Answer 5

1． 运行Java字节码的假想计算机称为JVM(Java虚拟机)。
2． Java程序分为两种类型，分别是java application(java应用程序，可独立运行)和java applet(java小应用程序，不能独立运行) 。
3． 开发工具JDK中的Javac(Java编译器)的作用是将Java源文件编译为Java字节码文件。
4． 在Java语言中，short数据类型的存储开销是16字节，而long数据类型的存储开销是64位。
5． Java语言的继承机制是单一继承，使用接口作为多重继承的替代物。
6． 对类中成员的访问，Java提供了四个不同的访问范围，分别是public、protected、private
    和default(firendly)。
7． 子类和父类中覆盖的方法，要具有相同的方法名、相同的参数类型和相同的返回值类型。
8． 将Applet小应用程序嵌入到HTML文件中，要用<applet></applet> 标记，其中它还有三个基本参数，分别是 code、width和height。
9． 如果x = 2，y = 5，z = 6；则 u = x > y ? ( x > z ? x : y ) : ( y > z ? y : ( z > x ? z : x ) )；则u =6。
10．在Java中，所有的异常类都是Throwable类的子类，该类有两个最基本的子类分别是Error和Exception。
11．异常处理的基本结构分为三部分，每部分的关键字分别是try、catch 和finally 。
12．Java采用抢占式调度方式，即高优先级线程具有剥夺低优先级线程执行的权利。
13．创建新线程的两种方法是继承Thread类重写run()方法和实现Runnable接口。
14. 若有int i = 2，b = 0；表达式b = ( ++i ) + ( ++i ) + ( ++i ) 的值是12。