我需要使用基于var edgeT = document.createElement('div');
edgeT.style.position = "fixed"
edgeT.style.top = 0;
edgeT.style.left = 0;
edgeT.style.width = "100%";
edgeT.style.height = "5px";
edgeT.style.backgroundColor= "black";
document.body.appendChild(edgeT);
var edgeB = document.createElement('div');
edgeB.style.position = "fixed"
edgeB.style.bottom = 0;
edgeB.style.left = 0;
edgeB.style.width = "100%";
edgeB.style.height = "5px";
edgeB.style.backgroundColor= "black";
document.body.appendChild(edgeB);
var edgeL = document.createElement('div');
edgeL.style.position = "fixed"
edgeL.style.left = 0;
edgeL.style.top = 0;
edgeL.style.width = "5px";
edgeL.style.height = "100%";
edgeL.style.backgroundColor= "black";
document.body.appendChild(edgeL);
var edgeR = document.createElement('div');
edgeR.style.position = "fixed"
edgeR.style.right = 0;
edgeR.style.top = 0;
edgeR.style.width = "5px";
edgeR.style.height = "100%";
edgeR.style.backgroundColor= "black";
document.body.appendChild(edgeR);
的脚本，但它没有安装在我的Fedora 21上：
xxd所以我尝试搜索并安装它没有成功：
$ xxd
bash: xxd: command not found
$ yum install xxd
(fails)
$ yum search xxd
(fails)
$ yum search all xxd
(fails - detailed log below)
Loaded plugins: langpacks
================================================================= Matched: xxd ========
perl-Data-HexDump-XXD.noarch : Format hexadecimal dump like xxd
xxdiff.i686 : Graphical file and directories comparator and merge tool
xxdiff-tools.i686 : Tools for xxdiff
吗？（我的意思是使用Fedora存储库中的xxd安装的官方软件包）。提前感谢您的帮助！
答案 0 :(得分：22)
xxd位于vim-common包中。
您可以使用yum whatprovides '*bin/xxd'。
答案 1 :(得分：15)
你试过吗
if(mysql_num_rows($r2)>0){
$msg2="Email already exist";
echo "<span style='color: red'>" . $msg2 . "</span>;
}