在html文档最上面加上（不论是php文档还是html文档）（html文档去掉<!DOCTYPE html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" > <!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" > <!DOCTYPE HTML PUBLIC "http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
解决方法来源：http://blog.csdn.net/dong123dddd/article/details/51088267
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