Question

大家好日子，对不起，如果你发现这个问题愚蠢。任何人都可以帮助我如何更改打印输出的字体？他们说.style.fontSize，但我不知道如何在该代码中使用它。任何帮助将非常感激。谢谢！

<html>
<body>
<div id="display-date">
        <script language="javascript"> 
        today = new Date();
        var month = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
        var day = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
        var yr = today.getYear();


        if(yr < 1900) yr += 1900;
        document.write(today.getDate() + " " + month[today.getMonth()] + " " + yr);
        </script>
</div>
</body>
</html>

Answer 1

我建议如下：

document.getElementById('display-date').style.fontSize = '2em'; // or whatever measurement.

而且，因为我有一些时间，这是一个功能：

function fontSizeChange(elem, factor) {
    if (!elem) {
        return false;
    }
    else {
        factor = factor || 2; // 2 is the default
        elem = elem.nodeType && elem.nodeType === 1 ? elem : document.getElementById(elem);
        var cur = window.getComputedStyle(elem, null).fontSize,
            size = parseInt(cur.replace(/\D+/g,''),10),
            unit = cur.replace(/\d+/g,'');
        elem.style.fontSize = (size * factor) + unit;
    }    
}

这样打电话：

fontSizeChange('display-date', 3);

JS Fiddle demo

或者：

fontSizeChange(document.getElementById('display-date'), 4);

JS Fiddle demo

或者（如果你想使用默认设置，你可以省略factor参数）：

fontSizeChange('display-date');

JS Fiddle demo

当然，你也可以收缩：

fontSizeChange('display-date',0.25);

JS Fiddle demo

当然，您也可以使用CSS：

#display-date {
    font-size: 2em;
}

JS Fiddle demo

一个更新版本，允许将调整大小附加到返回的元素（document.querySelector() / document.getElementById()）或nodeList（document.getElementsByTagName() / document.querySelectorAll()）：

Object.prototype.resize = function (prop, factor) {
    if (prop) {
        factor = parseFloat(factor) || 2;
        var self = this.length ? this : [this],
            cur, size, unit;
        for (var i = 0, len = self.length; i < len; i++) {
            var cur = window.getComputedStyle(self[i],null)[prop],
                size = parseFloat(cur.replace(/\D/g,'')),
                unit = cur.replace(/\d+/g,'');
            self[i].style[prop] = (size * factor) + unit;
        }
    }
    return this;
};

document.getElementsByTagName('div').resize('width',3);
document.getElementById('display-date').resize('font-size', 2.5);

JS Fiddle demo

Object.prototype.resize = function (prop, factor) {
    if (prop) {
        factor = parseFloat(factor) || 2;
        var self = this.length ? this : [this],
            cur, size, unit;
        for (var i = 0, len = self.length; i < len; i++) {
            var cur = window.getComputedStyle(self[i],null)[prop],
                size = parseFloat(cur.replace(/\D/g,'')),
                unit = cur.replace(/\d+/g,'');
            self[i].style[prop] = (size * factor) + unit;
        }
    }
    return this;
};

document.querySelectorAll('div').resize('height',3);
document.querySelector('#display-date').resize('font-size', 0.5);

JS Fiddle demo

参考文献：

element.style。

Answer 2

您可以使用style属性更改javascript的css属性

document.getElementById('display-date').style.fontSize = '2em'

Answer 3

您可以执行类似以下的操作

，而不是使用document.write

<style>
  .my_style_class
 {
   // add your font styling information here
   font-size: small;
 }
</style>
<div id="display-date" class="my_style_class">        
</div>

<script>
   document.getElementById("display-date").innerHTML = your_function_which_gets_the_date();
</script>

javascript更改字体大小

3 个答案: