$(function() {
		$(".word_break").each(function() {
			var word = $(this).text();
			var step = 25;//步长
			var len = word.length;
		   if(len > step) {
			   var newWord = new Array();
			   for(var i = step; i < len+step; i+=step) {
				   newWord.push(word.substring(i-step,i));
				   newWord.push("<br>");
			   }
			   $(this).html(newWord.join(""));
		   }
		});
	})

?