if (document.documentElement.clientHeight < document.documentElement.offsetHeight) scroll = true;

要使用 document.documentElement ,必须在页面头部加入声明:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">






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