您可以使用max-content来测量文本的像素宽度。

这是一个效用函数。它可以选择将任何节点作为上下文来计算宽度，考虑到任何CSS，如字体大小、字母间距等。

function measureTextPxWidth( text, template = document.createElement("span") ) { const measurer = template.cloneNode(); measurer.style.setProperty("all", "revert", "important"); measurer.style.setProperty("position", "position", "important"); measurer.style.setProperty("visibility", "hidden", "important"); measurer.style.setProperty("width", "max-content", "important"); measurer.innerText = text; document.body.appendChild(measurer); const { width } = measurer.getBoundingClientRect(); document.body.removeChild(measurer); return width; } document.querySelector('.spanTextWidth').innerText = `${measureTextPxWidth('one two three')}px` document.querySelector('.h1TextWidth').innerText = `${measureTextPxWidth('one two three', document.querySelector('h1'))}px` h1 { letter-spacing: 3px; } <span>one two three</span> <div class="spanTextWidth"></div> <h1>one two three</h1> <div class="h1TextWidth"></div>

没有jQuery:

String.prototype.width = function (fontSize) {
    var el,
        f = fontSize + " px arial" || '12px arial';
    el = document.createElement('div');
    el.style.position = 'absolute';
    el.style.float = "left";
    el.style.whiteSpace = 'nowrap';
    el.style.visibility = 'hidden';
    el.style.font = f;
    el.innerHTML = this;
    el = document.body.appendChild(el);
    w = el.offsetWidth;
    el.parentNode.removeChild(el);
    return w;
}

// Usage
"MyString".width(12);

你可以使用画布，这样你就不必处理这么多css属性:

var canvas = document.createElement("canvas");
var ctx = canvas.getContext("2d");
ctx.font = "20pt Arial";  // This can be set programmaticly from the element's font-style if desired
var textWidth = ctx.measureText($("#myElement").text()).width;

我猜这和Depak的条目很相似，但这是基于Louis Lazaris在impressiveweb页面上发表的一篇文章

(function($){

        $.fn.autofit = function() {             

            var hiddenDiv = $(document.createElement('div')),
            content = null;

            hiddenDiv.css('display','none');

            $('body').append(hiddenDiv);

            $(this).bind('fit keyup keydown blur update focus',function () {
                content = $(this).val();

                content = content.replace(/\n/g, '<br>');
                hiddenDiv.html(content);

                $(this).css('width', hiddenDiv.width());

            });

            return this;

        };
    })(jQuery);

fit事件用于在函数关联到控件之后立即执行函数调用。

例如:$(“输入”).autofit () .trigger(“适合”);

<span id="text">Text</span>

<script>
var textWidth = document.getElementById("text").offsetWidth;
</script>

只要<span>标记没有应用其他样式，这就可以工作。 offsetWidth将包括任何边框的宽度，水平填充，垂直滚动条宽度等。

工作示例:http://jsfiddle.net/tdpLdqpo/1/

HTML:

<h1 id="test1">
    How wide is this text?
</h1>
<div id="result1"></div>
<hr/>
<p id="test2">
    How wide is this text?
</p>
<div id="result2"></div>
<hr/>
<p id="test3">
    How wide is this text?<br/><br/>
    f sdfj f sdlfj lfj lsdk jflsjd fljsd flj sflj sldfj lsdfjlsdjkf sfjoifoewj flsdjfl jofjlgjdlsfjsdofjisdojfsdmfnnfoisjfoi  ojfo dsjfo jdsofjsodnfo sjfoj ifjjfoewj fofew jfos fojo foew jofj s f j
</p>
<div id="result3"></div>

JavaScript代码:

function getTextWidth(text, font) {
    var canvas = getTextWidth.canvas ||
        (getTextWidth.canvas = document.createElement("canvas"));
    var context = canvas.getContext("2d");
    context.font = font;
    var metrics = context.measureText(text);
    return metrics.width;
};

$("#result1")
.text("answer: " +
    getTextWidth(
             $("#test1").text(),
             $("#test1").css("font")) + " px");

$("#result2")
    .text("answer: " +
        getTextWidth(
             $("#test2").text(),
             $("#test2").css("font")) + " px");

$("#result3")
    .text("answer: " +
        getTextWidth(
             $("#test3").text(),
             $("#test3").css("font")) + " px");