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关于jquery字体大小设置和插件详解

伊谢尔伦

发布： 2017-06-17 09:38:18

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1703人浏览过

jquery字体大小的设置，先获取字体大小，进行处理。再将修改的值保存。slice() 方法可从已有的数组中返回选定的元素。

arrayObject.slice(start,end)。

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start 必需。规定从何处开始选取。如果是负数，那么它规定从数组尾部开始算起的位置。也就是说，-1 指最后一个元素，-2 指倒数第二个元素，以此类推。
end 可选。规定从何处结束选取。该参数是数组片断结束处的数组下标。如果没有指定该参数，那么切分的数组包含从 start 到数组结束的所有元素。如果这个参数是负数，那么它规定的是从数组尾部开始算起的元素。
jQuery代码如下：

<script type="text/javascript">
    $(function(){
        $("span").click(function(){
            //获取para的字体大小
            var thisEle = $("#para").css("font-size"); 
            //parseFloat的第二个参数表示转化的进制，10就表示转为10进制
            var textFontSize = parseFloat(thisEle , 10);
            //javascript自带方法
            var unit = thisEle.slice(-2); //获取单位
            var cName = $(this).attr("class");
            if(cName == "bigger"){
                    textFontSize += 2;
            }else if(cName == "smaller"){
                    textFontSize -= 2;
            }
            //设置para的字体大小
            $("#para").css("font-size",  textFontSize + unit );
        });
    });
  </script>

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html代码如下：

<body>
<div class="msg">
    <div class="msg_caption">
        <span class="bigger" >放大</span>
        <span class="smaller" >缩小</span>
    </div>
    <div>
        <p id="para" >
        This is some text. This is some text. This is some text. This is some text. This
        is some text. This is some text. This is some text. This is some text. This is some
        text. This is some text. This is some text. This is some text. This is some text.
        This is some text. This is some text. This is some text. This is some text. This
        is some text. This is some text.
        </p>
    </div>
</div>
</body>

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介绍一个jQuery调整字体大小插件PDFontSize

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="pandao " />
<meta name="keywords" content="pandao " />
<meta name="description" content="pandao " />
<meta name="author" content="pandao" />
<!--
<link rel="stylesheet" type="text/css" href="css/style.css" />
<link rel="shortcut icon" href="images/favicon.ico" />
-->
<title>jQuery调整字体大小插件PDFontSize </title>
<style type="text/css">
*{margin:0;padding:0;}
body{font-size:14px;color:#444;font-family:"微软雅黑",Arial;background:#fff;}
a{color:#444;text-decoration: none;}
a:hover{color:#065BC2;text-decoration: none;}
.clear{clear:both;}
img{border:none;vertical-align: middle;}
ul{list-style: none;}
#test{overflow:hidden;width:50%;margin:30px auto 10px auto;background:#f6f6f6;border:1px solid #eee;padding:15px;}
#toolbar{width:300px;margin:0 auto;text-align:center;}
/*
按钮样式，也可通过插件参数设置
.PDFontSizeBtns{display:inline-block;padding:2px 5px;background:#f6f6f6;border:1px solid #eee;cursor: pointer;}
.PDFontSizeBtns:hover{border:1px solid #ddd;background:#eee;}*/
</style>
</head>
<body> 
<div id="test">jQuery.PDFontSize()</div>
<div id="toolbar">
    <a href="javascript:;" class="PDFontSizeBtns" id="minus">A-</a>
    <a href="javascript:;" class="PDFontSizeBtns" id="default">A</a>
    <a href="javascript:;" class="PDFontSizeBtns" id="plus">A+</a>
</div> 
<script type="text/javascript" src="http://code.jquery.com/jquery-1.6.4.min.js"></script>
<script type="text/javascript">
jQuery.easing[&#39;jswing&#39;]=jQuery.easing[&#39;swing&#39;];jQuery.extend(jQuery.easing,
{def:&#39;easeOutQuad&#39;,swing:function(x,t,b,c,d)
{return jQuery.easing[jQuery.easing.def](x,t,b,c,d)},easeInQuad:function(x,t,b,c,d)
{return c*(t/=d)*t+b},easeOutQuad:function(x,t,b,c,d)
{return-c*(t/=d)*(t-2)+b},easeInOutQuad:function(x,t,b,c,d)
{if((t/=d/2)<1)return c/2*t*t+b;return-c/2*((--t)*(t-2)-1)+b},easeInCubic:function(x,t,b,c,d)
{return c*(t/=d)*t*t+b},easeOutCubic:function(x,t,b,c,d)
{return c*((t=t/d-1)*t*t+1)+b},easeInOutCubic:function(x,t,b,c,d)
{if((t/=d/2)<1)return c/2*t*t*t+b;return c/2*((t-=2)*t*t+2)+b},easeInQuart:function(x,t,b,c,d)
{return c*(t/=d)*t*t*t+b},easeOutQuart:function(x,t,b,c,d)
{return-c*((t=t/d-1)*t*t*t-1)+b},easeInOutQuart:function(x,t,b,c,d)
{if((t/=d/2)<1)return c/2*t*t*t*t+b;return-c/2*((t-=2)*t*t*t-2)+b},easeInQuint:function(x,t,b,c,d)
{return c*(t/=d)*t*t*t*t+b},easeOutQuint:function(x,t,b,c,d)
{return c*((t=t/d-1)*t*t*t*t+1)+b},easeInOutQuint:function(x,t,b,c,d)
{if((t/=d/2)<1)return c/2*t*t*t*t*t+b;return c/2*((t-=2)*t*t*t*t+2)+b},easeInSine:function(x,t,b,c,d)
{return-c*Math.cos(t/d*(Math.PI/2))+c+b},easeOutSine:function(x,t,b,c,d)
{return c*Math.sin(t/d*(Math.PI/2))+b},easeInOutSine:function(x,t,b,c,d)
{return-c/2*(Math.cos(Math.PI*t/d)-1)+b},easeInExpo:function(x,t,b,c,d)
{return(t==0)?b:c*Math.pow(2,10*(t/d-1))+b},easeOutExpo:function(x,t,b,c,d)
{return(t==d)?b+c:c*(-Math.pow(2,-10*t/d)+1)+b},easeInOutExpo:function(x,t,b,c,d)
{if(t==0)return b;if(t==d)return b+c;if((t/=d/2)<1)return c/2*Math.pow(2,10*(t-1))+b;return c/2*(-Math.pow(2,-10*--t)+2)+b},easeInCirc:function(x,t,b,c,d)
{return-c*(Math.sqrt(1-(t/=d)*t)-1)+b},easeOutCirc:function(x,t,b,c,d){return c*Math.sqrt(1-(t=t/d-1)*t)+b},easeInOutCirc:function(x,t,b,c,d)
{if((t/=d/2)<1)return-c/2*(Math.sqrt(1-t*t)-1)+b;return c/2*(Math.sqrt(1-(t-=2)*t)+1)+b},easeInElastic:function(x,t,b,c,d)
{var s=1.70158;var p=0;var a=c;if(t==0)return b;if((t/=d)==1)return b+c;if(!p)p=d*.3;if(a<Math.abs(c)){a=c;var s=p/4}else var s=p/(2*Math.PI)*Math.asin(c/a);
return-(a*Math.pow(2,10*(t-=1))*Math.sin((t*d-s)*(2*Math.PI)/p))+b},easeOutElastic:function(x,t,b,c,d)
{var s=1.70158;var p=0;var a=c;if(t==0)return b;if((t/=d)==1)return b+c;if(!p)p=d*.3;if(a<Math.abs(c))
{a=c;var s=p/4}else var s=p/(2*Math.PI)*Math.asin(c/a);return a*Math.pow(2,-10*t)*Math.sin((t*d-s)*(2*Math.PI)/p)+c+b},easeInOutElastic:function(x,t,b,c,d)
{var s=1.70158;var p=0;var a=c;if(t==0)return b;if((t/=d/2)==2)return b+c;if(!p)p=d*(.3*1.5);if(a<Math.abs(c))
{a=c;var s=p/4}else var s=p/(2*Math.PI)*Math.asin(c/a);if(t<1)return-.5*(a*Math.pow(2,10*(t-=1))*Math.sin((t*d-s)*(2*Math.PI)/p))+b;
return a*Math.pow(2,-10*(t-=1))*Math.sin((t*d-s)*(2*Math.PI)/p)*.5+c+b},easeInBack:function(x,t,b,c,d,s)
{if(s==undefined)s=1.70158;return c*(t/=d)*t*((s+1)*t-s)+b},easeOutBack:function(x,t,b,c,d,s)
{if(s==undefined)s=1.70158;return c*((t=t/d-1)*t*((s+1)*t+s)+1)+b},easeInOutBack:function(x,t,b,c,d,s)
{if(s==undefined)s=1.70158;if((t/=d/2)<1)return c/2*(t*t*(((s*=(1.525))+1)*t-s))+b;
return c/2*((t-=2)*t*(((s*=(1.525))+1)*t+s)+2)+b},easeInBounce:function(x,t,b,c,d)
{return c-jQuery.easing.easeOutBounce(x,d-t,0,c,d)+b},easeOutBounce:function(x,t,b,c,d){if((t/=d)<(1/2.75))
{return c*(7.5625*t*t)+b}else if(t<(2/2.75)){return c*(7.5625*(t-=(1.5/2.75))*t+.75)+b}else if(t<(2.5/2.75))
{return c*(7.5625*(t-=(2.25/2.75))*t+.9375)+b}else{return c*(7.5625*(t-=(2.625/2.75))*t+.984375)+b}},easeInOutBounce:function(x,t,b,c,d)
{if(t<d/2)return jQuery.easing.easeInBounce(x,t*2,0,c,d)*.5+b;return jQuery.easing.easeOutBounce(x,t*2-d,0,c,d)*.5+c*.5+b}});
 
(function() {
    /**
    * jQuery调整字体大小插件PDFontSize (全兼容)
    */
    $.fn.extend({
        PDFontSize : function(_params) {
            //默认参数
            var params = {
                max : 40,        //最大的字体大小
                min : 12,        //最小的字体大小
                change : 5,      //每次增加或减小的大小
                plusBtn : &#39;&#39;,    //#plus
                minusBtn : &#39;&#39;,   //#minus
                defaultBtn : &#39;&#39;, //#default
                animate : true,          //是否使用动画变化
                animateTime : 300,       //动画变化时间
                easing : &#39;easeOutQuart&#39;, //动画缓动，需要使用jQuery.easing插件
                btnStyle : {display:&#39;inline-block&#39;, padding:&#39;2px 5px&#39;, background:&#39;#f6f6f6&#39;, border:&#39;1px solid #eee&#39;, cursor: &#39;pointer&#39;}, //按钮样式(正常)
                btnHoverStyle : {border:&#39;1px solid #ddd&#39;, background:&#39;#eee&#39;} //按钮样式(鼠标经过)
            };
 
            if(_params) params = $.extend(params, _params);  //扩展默认参数
 
            var contentObj = $(this);  //内容层对象
 
            var fontSizeHandler = function(fontSize) {
                //alert(&#39;fontSizeHandler();&#39;);
                if(params.animate == true)
                {
                    contentObj.animate({fontSize : fontSize + &#39;px&#39;}, params.animateTime, params.easing);
                }
                else
                {
                    contentObj.css({fontSize : fontSize + &#39;px&#39;});
                }
            };
 
            if($(params.plusBtn))
            {
                $(params.plusBtn).bind(&#39;click&#39;, function() {
                    var fontSize = parseInt(contentObj.css(&#39;fontSize&#39;));
 
                    if(fontSize < params.max)
                    {
                        fontSize += params.change;
                        if(fontSize > params.max) fontSize = params.max;
 
                        fontSizeHandler(fontSize);
                    }
                });
            }
 
            if($(params.minusBtn))
            {
                $(params.minusBtn).bind(&#39;click&#39;, function() {
                    var fontSize = parseInt(contentObj.css(&#39;fontSize&#39;));
 
                    if(fontSize > params.min)
                    {
                        fontSize -= params.change;
                        if(fontSize < params.min) fontSize = params.min;
                        fontSizeHandler(fontSize);
                    }
                });
            }
 
            if($(params.defaultBtn))
            {
                $(params.defaultBtn).bind(&#39;click&#39;, function() {
                    fontSizeHandler(params.min);
                });
            }
 
            $(&#39;.PDFontSizeBtns&#39;).css(params.btnStyle);
 
            $(&#39;.PDFontSizeBtns&#39;).hover(function() {
                $(this).css(params.btnHoverStyle);
            }, function() {
                $(this).css(params.btnStyle);
            });
 
            $(&#39;.PDFontSizeBtns&#39;).each(function() {
                $(this).click(function() {
                    $(this).blur();
                });
            });
 
            return this;
        }
    });
})();
 
//使用方法
$(function() {
    $(&#39;#test&#39;).PDFontSize({
        max : 100,
        //min : 12,
        change : 20,
        plusBtn : &#39;#plus&#39;,
        minusBtn : &#39;#minus&#39;,
        defaultBtn : &#39;#default&#39;
    });
});
</script>
</body>
</html>

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