我不确定这是否是你所期待的答案，但是，为什么不将树的宽度设置为“自动”和“视图”的宽度设置为100% ?

一个稍微不同的实现，

两个div面板(内容+额外)，并排，内容面板展开，如果额外面板不存在。

jsfiddle: http://jsfiddle.net/qLTMf/1722/

这将是一个很好的例子，说明用表处理起来很简单，而用CSS处理起来很难(如果不是不可能的话，至少在跨浏览器的意义上)。

如果两列的宽度都是固定的，这就很容易了。

如果其中一列的宽度是固定的，这将稍微困难一些，但完全可行。

两个列的宽度可变，恕我直言，你只需要使用一个两列的表。

.container{ display: flex; align-items: stretch; } .resize_overflow { position: relative; width: 0; overflow: hidden; white-space: nowrap; word-wrap: normal; /* text-overflow: ellipsis; When the end of the line dissolves, the ellipsis loses */ } .second_fix { float: right; /* or: display: flex; align-self: end;*/ } /* Dissolve the end of the line at the right edge */ .resize_overflow::after { content: ""; /* Empty content */ position: absolute; /* Position relative to parent */ right: 0; /* Element position */ top: 0; /* Element position */ width: 40px; /* Gradient width */ height: 100%; /* Parent Height */ background: -moz-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%); background: -webkit-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%); background: -o-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%); background: -ms-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%); background: linear-gradient(to right, rgba(255,255,255, 0.2), #ff 100%); } <div class="container"> <div class="resize_overflow">Tree</div> <div class="second_fix">View</div> </div>

.btnCont { display: table-layout; width: 500px; } .txtCont { display: table-cell; width: 70%; max-width: 80%; min-width: 20%; } .subCont { display: table-cell; width: 30%; max-width: 80%; min-width: 20%; } <div class="btnCont"> <div class="txtCont"> Long text that will auto adjust as it grows. The best part is that the width of the container would not go beyond 500px! </div> <div class="subCont"> This column as well as the entire container works like a table. Isn't Amazing!!! </div> </div>

我写了一个javascript函数，从jQuery $(document).ready()调用。这将解析父div的所有子div，只更新最右边的子div。

html

...
<div class="stretch">
<div style="padding-left: 5px; padding-right: 5px; display: inline-block;">Some text
</div>
<div class="underline" style="display: inline-block;">Some other text
</div>
</div>
....

javascript

$(document).ready(function(){
    stretchDivs();
});

function stretchDivs() {
    // loop thru each <div> that has class='stretch'
    $("div.stretch").each(function(){
        // get the inner width of this <div> that has class='stretch'
        var totalW = parseInt($(this).css("width"));
        // loop thru each child node
        $(this).children().each(function(){
            // subtract the margins, borders and padding
            totalW -= (parseInt($(this).css("margin-left")) 
                     + parseInt($(this).css("border-left-width")) 
                     + parseInt($(this).css("padding-left"))
                     + parseInt($(this).css("margin-right")) 
                     + parseInt($(this).css("border-right-width")) 
                     + parseInt($(this).css("padding-right")));
            // if this is the last child, we can set its width
            if ($(this).is(":last-child")) {
                $(this).css("width","" + (totalW - 1 /* fudge factor */) + "px");
            } else {
                // this is not the last child, so subtract its width too
                totalW -= parseInt($(this).css("width"));
            }
        });
    });
}