基于JS实现PHP的sprintf函数实例

<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>

<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>