Mikel
pre标签会原样保留HTML内容的格式，可是如果宽度过大会把页面撑坏，这时候需要自动换行来帮忙：
Wrapping the pre tag
Making preformated text wrap in CSS3, Mozilla, Opera and IEis the tip that let's you use the pre tag to keep the formatting, without cursing yourself when some of the content is too long and doesn't wrap:
/* Browser specific (not valid) styles to make preformatted text wrap */ pre { white-space: pre-wrap; /* css-3 */ white-space: -moz-pre-wrap; /* Mozilla, since 1999 */ white-space: -pre-wrap; /* Opera 4-6 */ white-space: -o-pre-wrap; /* Opera 7 */ word-wrap: break-word; /* Internet Explorer 5.5+ */ }父标记最好加个DIV,并设置CSS属性：word-wrap: break-word;white-space : normal；
