code: function compressCss(fc) {
  	var content = fc.replace(reg_comment, '').replace(/^[\s\r\n]+/, ''),
  		i = 0, len = content.length,
  		buf = '', //压缩结果buffer
  		lc = '', //前一个字符
  		c;
  	for (; i < len; i++) {
  		c = content[i];
  		if (c==='\r' || c==='\n') {
  			continue;
  		}
  		if (c===' ' || c==='\t') {
  			if (reg_scs.test(lc)) {
  				continue;
  			}
  			buf += lc;
  			lc = ' ';
  			continue;
  		} else if (reg_scs.test(c)) {
  			if (lc===' ' || (c==='}' && lc===';')) {
  				lc = c;
  				continue;
  			}
  		}
  		buf += lc;
  		lc = c;
  	}
  
  	return buf + lc;
  }
docs: 压缩css内容