仅将边框添加到换行文本的底部

我试图在一些换行文本上实现下划线，该下划线适合底行文本的宽度，同时仅出现在该底线下方。图1说明了期望的效果

Figure 1

使用这个 HTML：

<h2><span class="inline-block">optatur, volendit inum simolor</span></h2>

并设置span to display:inline;我可以让下划线与文本的宽度完美契合，但它会为所有文本添加下划线。

Or，设置span to display:inline-block;我可以让下划线仅出现在底线下方，但随后它会填充父级的整个宽度。

请参阅 JSfiddle 了解上述示例：http://jsfiddle.net/PWDV7/1/ http://jsfiddle.net/PWDV7/1/

有什么办法可以达到图1的效果吗？

凭借良好的腿从这个答案 https://stackoverflow.com/questions/3738490/finding-line-wraps/3744583#3744583对于有关查找换行的问题，我设法提出了这个解决方案（简而言之，它涉及使用 JS 来查找发生换行的位置，并将跨度包裹在最后一行的所有文本周围）：

function underLineText () {
    $underlined_text.each(function(){
        var $this = $(this);
        var text = $this.text();
        var originalText = text;
        var breakWords = new Array();

        //split the words into individual strings 
        var words = text.split(' ');

        //find the height of the first word
        $this.text(words[0]);
        var height = $this.height();

        //if there is more than one word
        if (words.length > 1) {
            //loop through all the words
            for(var i = 1; i < words.length; i++){
                $this.text($this.text() + ' ' + words[i]);

                //check if the current word has a different height from the previous word
                //if this is true, we have witnessed a word wrap!
                if($this.height() > height){
                    height = $this.height();
                    //add the first word after the wrap to a predefined array
                    breakWords.push(words[i]);
                }

                //on the last iteration on the loop...
                if (i === words.length - 1) {
                    if (breakWords.length > 0) {
                        //select the last word of the breakWords array
                        //(this is to handle cases where there there are more than one line or word wraps)
                        var breakStartAt = breakWords[breakWords.length - 1];
                        //add a span before the last word
                        var withSpan = '<span>'+breakStartAt;
                        //replace the last occurrence of this word with the span wrapped version
                        //(this is to handle cases where there are more than one occurrences of the last word)
                        originalText = originalText.replaceLast(breakStartAt,withSpan);
                        //close the last line with a span
                        originalText += "</span>";

                    }
                }
            }
        }
        //if there are no word wraps, wrap the whole text in spans
        else {
            originalText = '<span>'+originalText+'</span>';
        }

        //replace the original text with the span-wrapped mod
        $(this).html(originalText);
    });
}

你可以在这里看到它的工作原理：http://jsfiddle.net/PWDV7/5/ http://jsfiddle.net/PWDV7/5/