转　用JS实现PHP的sprintf函数

函数如下：<script type="text/javascript">function sprintf(){    var arg = arguments,        str = arg[0] || '',        i, n;    for (i = 1, n = arg.length; i < n; i++) {        str = str.replace(/%s/, arg[i]);    }    return str;}</script> 第一个参数是包含的“%s”的字符串，其他参数是对应的用来替换“%s”的变量。如：<script type="text/javascript">var str = "床前%s明光，疑是%s上霜；举头%s明月，低头%s故乡。",    var1 = "明",    var2 = "地",    var3 = "望",     var4 = "思";str = sprintf(str, var1, var2, var3， var4);</script>