js正则获取图片的src属性及正则分割一个字符串

try
{  
   var str='<P>xczxzxzxcxcxc<IMG src="https://file.ynet.com/2/1612/12/12119048.jpg" mce_src="https://file.ynet.com/2/1612/12/12119048.jpg">dfsd<IMG src="https://file.ynet.com/2/1612/12/12119048.jpg" mce_src="https://file.ynet.com/2/1612/12/12119048.jpg">sdfs</P>';   var str='<P>xczxzxzxcxcxc<IMG src="htt