javascript 去除空行

/**
* 去除空行
*/
function clearBlankLine(_sHtml){
var vReturn=_sHtml;
var vPatterns=[
'<p(>|\\s+[^>]*>)(&nbsp|&nbsp;|\\s|　|<br\\s*(\/)?>)*<\/p(>|\\s+[^>]*>)',
'(<br\\s*(\/)?>((\\s|&nbsp;|&nbsp|　)*)){2,}',
'(<p(>|\\s+[^>]*>))((&nbsp|&nbsp;|\\s)*<br\\s*(\/)?>)*((.|\n|\r)*?<\/p(>|\\s+[^>]*>))'
];
var vReplaces=[
'',
'<br>$3',
'$1$6'
];
for(var i=0;i<vPatterns.length;i++){
var vRegExp = new RegExp(vPatterns[i], 'img');
vReturn=vReturn.replace(vRegExp,vReplaces[i]);
}
return vReturn;
}