修改了我的第一个答案。现在效果好多了。见小提琴。它基于您在枢纽词上拆分段落的想法。枢轴词和最后一节被放回段落中。前半部分（在枢轴词之前）然后被拆分为一个数组，该数组向后遍历（每次弹出最后一个元素）以填充跨度，直到达到其宽度。这将不断重复，直到数组中没有更多的单词。我不是以英语为母语的人，所以我希望这一切都有意义。
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
<script type="text/javascript" src="js/jquery-1.9.0/jquery.min.js"></script>
<style type="text/css">
.container {
width: 500px;
border: 1px solid #ddd;
}
.pivotWord {
background-color: red;
color: white;
font-weight: bold;
}
</style>
</head>
<body>
<div class="container">
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in PIVOT voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. PIVOT Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et PIVOT dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
<p>
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non PIVOT proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>
</div>
<script type="text/javascript">
function pivotAround(pivotword){
$('p').each(function(){
//initialize a few things
var sentence = $(this).html();
var splittedSentence = sentence.split(pivotword);
var paragraphWidth = $(this).width();
$(this).html("");
//create elements from the sentence parts.
var pivotSpan = $("<span />", {
'class': 'pivotWord'
}).html(pivotword);
var postSpan = $("<span />", {
}).html(splittedSentence[1]);
//append them to the DOM
$(this).append(pivotSpan)
.append(postSpan);
//get size of pivotSpan
var pivotSpanWidth = pivotSpan.width();
//calculate where the pivot word should be
var pivotSpanLeftMargin = (paragraphWidth / 2) - (pivotSpanWidth / 2);
//make global array of splittedSentence[0]
preSpanArray = splittedSentence[0].split(' ');
distributeWithinMargin(pivotSpanLeftMargin, this);
//array not empty?
while(preSpanArray.length > 0){
distributeWithinMargin(paragraphWidth, this);
}
});
}
function distributeWithinMargin(margin, element) {
var span = $("<span />", {
'style': 'margin-left: -40000px'
});
$(element).prepend(span);
while (preSpanArray.length > 0 && span.width() <= margin) {
var lastElement = preSpanArray.pop();
span.prepend(lastElement + " ");
}
/*
* last word makes the span too wide, so push it back to the stack
* only do this when array not empty, or you will end up in an
* endless loop
*/
if (preSpanArray.length > 0) {
preSpanArray.push(lastElement);
//remove that word from the span
var firstSpaceIndex = $(span).html().indexOf(" ");
$(span).html($(span).html().substring(firstSpaceIndex + 1));
}
//calculate the text-indent from that value
var textIndent = margin - span.width();
$(span).css('margin-left', textIndent);
}
pivotAround("PIVOT");
</script>
</body>
</html>