jQuery字體大小的設置，先取得字體大小，進行處理。 再儲存修改的值。 slice() 方法可從現有的陣列中傳回選定的元素。
arrayObject.slice(start,end)。
start 必需。規定從何處開始選取。如果是負數，那麼它規定從數組尾部開始算起的位置。也就是說，-1 指最後一個元素，-2 指倒數第二個元素，以此類推。
end 可選。規定從何處結束選取。此參數是數組片斷結束處的數組下標。如果沒有指定該參數，那麼切分的陣列包含從 start 到陣列結束的所有元素。如果這個參數是負數，那麼它規定的是從陣列尾部開始算起的元素。
jQuery程式碼如下：
<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>html程式碼如下：
<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>介紹一個jQuery調整字體大小外掛程式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['jswing']=jQuery.easing['swing'];jQuery.extend(jQuery.easing,
{def:'easeOutQuad',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 : '', //#plus
minusBtn : '', //#minus
defaultBtn : '', //#default
animate : true, //是否使用动画变化
animateTime : 300, //动画变化时间
easing : 'easeOutQuart', //动画缓动，需要使用jQuery.easing插件
btnStyle : {display:'inline-block', padding:'2px 5px', background:'#f6f6f6', border:'1px solid #eee', cursor: 'pointer'}, //按钮样式(正常)
btnHoverStyle : {border:'1px solid #ddd', background:'#eee'} //按钮样式(鼠标经过)
};
if(_params) params = $.extend(params, _params); //扩展默认参数
var contentObj = $(this); //内容层对象
var fontSizeHandler = function(fontSize) {
//alert('fontSizeHandler();');
if(params.animate == true)
{
contentObj.animate({fontSize : fontSize + 'px'}, params.animateTime, params.easing);
}
else
{
contentObj.css({fontSize : fontSize + 'px'});
}
};
if($(params.plusBtn))
{
$(params.plusBtn).bind('click', function() {
var fontSize = parseInt(contentObj.css('fontSize'));
if(fontSize < params.max)
{
fontSize += params.change;
if(fontSize > params.max) fontSize = params.max;
fontSizeHandler(fontSize);
}
});
}
if($(params.minusBtn))
{
$(params.minusBtn).bind('click', function() {
var fontSize = parseInt(contentObj.css('fontSize'));
if(fontSize > params.min)
{
fontSize -= params.change;
if(fontSize < params.min) fontSize = params.min;
fontSizeHandler(fontSize);
}
});
}
if($(params.defaultBtn))
{
$(params.defaultBtn).bind('click', function() {
fontSizeHandler(params.min);
});
}
$('.PDFontSizeBtns').css(params.btnStyle);
$('.PDFontSizeBtns').hover(function() {
$(this).css(params.btnHoverStyle);
}, function() {
$(this).css(params.btnStyle);
});
$('.PDFontSizeBtns').each(function() {
$(this).click(function() {
$(this).blur();
});
});
return this;
}
});
})();
//使用方法
$(function() {
$('#test').PDFontSize({
max : 100,
//min : 12,
change : 20,
plusBtn : '#plus',
minusBtn : '#minus',
defaultBtn : '#default'
});
});
</script>
</body>
</html>以上是關於jquery字體大小設定與外掛程式詳解的詳細內容。更多資訊請關注PHP中文網其他相關文章！
