如何在本地存储中存储字体大小

我已经为用户创建了一个简单的调整大小的字体大小，但有问题将其存储在本地存储中，以便下次用户刷新页面或重新访问它时将设置为期望的字体大小。目前我只有一个页面才能工作，当我离开它时，它全部被重置。 https://jsfiddle.net/v77z0pzd/2/如何在本地存储中存储字体大小

$(document).ready(function() { 

    var size = localStorage.getItem('size'); 

//min font size 
var min=9; 

//max font size 
var max=16; 

//grab the default font size 
var reset = $('p').css('fontSize'); 

//font resize these elements 
var elm = $('p.intro, p.ending'); 

//set the default font size and remove px from the value 
var size = str_replace(reset, 'px', ''); 

//Increase font size 
$('a.fontSizePlus').click(function() { 

    //if the font size is lower or equal than the max value 
    if (size<=max) { 

     //increase the size 
     size++; 

     //set the font size 
     elm.css({'fontSize' : size}); 
     localStorage.setItem('size', size); 
    } 

    //cancel a click event 
    return false; 

}); 

$('a.fontSizeMinus').click(function() { 

    //if the font size is greater or equal than min value 
    if (size>=min) { 

     //decrease the size 
     size--; 

     //set the font size 
     elm.css({'fontSize' : size}); 
    } 

    //cancel a click event 
    return false; 

}); 

//Reset the font size 
$('a.fontReset').click(function() { 

    //set the default font size 
    elm.css({'fontSize' : reset});  
});});

我应该在哪里放置的localStorage。

来源

2016-12-16 computer

在修改字体大小的每一个事件处理程序。 – cezarypiatek

请注意，您通过以下命令覆盖从'localStorage'得到的大小：'var size = str_replace（reset，'px'，''）;'如果要存储默认大小，请选择另一个变量名称 –

你拨弄即使当size一个localStorage键设置不工作很简单，因为你是不是在设置存储大小重装，事实上，你用这条线覆盖它：

var size = str_replace(reset, 'px', '');

你的战略应该是为跟踪我已经重用你的代码，但重新被安排那么一点点：

检测默认字体大小
定义元素，其字体大小可以改变
从localStorage的获取size，如果存在：
- 如果是这样，将元素存储字体大小
- 如果不能，回落到默认大小

通过检查size是truthy，那么您可以使用它来设置页面重新加载时的字体大小：

// Grab the default font size 
var reset = $('p').css('fontSize'); 

// Font resize these elements 
var elm = $('p.intro, p.ending'); 

// Retrieve stored size from localStorage 
var size = localStorage.getItem('size'); 
if (size) { 
    // Yes, we found it 
    elm.css('font-size', size + 'px'); 
} else { 
    // No, it's not defined/stored 
    // Set the default font size and remove px from the value 
    size = str_replace(reset, 'px', ''); 
}

看到这里的工作小提琴：https://jsfiddle.net/teddyrised/v77z0pzd/6/

来源

2016-12-16 20:12:59 Terry

的相关差异

var size = localStorage.getItem('size');成为

var size = localStorage.getItem('size') || $('p').css('fontSize');

集elm.css({'fontSize': size});后var elm = $('p.intro, p.ending');

删除var size = str_replace(reset, 'px', '');

在缩小字体大小时添加缺少的localStorage.setItem('size', size);。

完整的文件

<html> 
    <head> 
    <script 
     src="https://code.jquery.com/jquery-3.1.1.slim.min.js" 
     integrity="sha256-/SIrNqv8h6QGKDuNoLGA4iret+kyesCkHGzVUUV0shc=" 
     crossorigin="anonymous"></script> 
    <style> 
     body { 
     font-size:12px; 
     font-family:arial; 
     } 

     a { 
     color:#c00; 
     text-decoration:none; 
     } 

     a:hover { 
     color:#f00; 
     text-decoration:underline; 
     } 
    </style> 
    </head> 
    <body> 

    <a href="#" class="fontSizePlus">A+</a> | 
    <a href="#" class="fontReset">Reset</a> | 
    <a href="#" class="fontSizeMinus">A-</a> 

    <p class="intro">Donec viverra auctor lobortis. Pellentesque eu est a nulla placerat dignissim. Morbi a enim in magna semper bibendum. Etiam scelerisque, nunc ac egestas consequat, odio nibh euismod nulla, eget auctor orci nibh vel nisi. Aliquam erat volutpat. Mauris vel neque sit amet nunc gravida congue sed sit amet purus. Quisque lacus quam, egestas ac tincidunt a, lacinia vel velit. Aenean facilisis nulla vitae urna tincidunt congue sed ut dui. Morbi malesuada nulla nec purus convallis consequat. Vivamus id mollis quam.</p> 

    <p>Morbi ac commodo nulla. In condimentum orci id nisl volutpat bibendum. Quisque commodo hendrerit lorem quis egestas. Maecenas quis tortor arcu. Vivamus rutrum nunc non neque consectetur quis placerat neque lobortis. Nam vestibulum, arcu sodales feugiat consectetur, nisl orci bibendum elit, eu euismod magna sapien ut nibh. Donec semper quam scelerisque tortor dictum gravida. In hac habitasse platea dictumst. Nam pulvinar, odio sed rhoncus suscipit, sem diam ultrices mauris, eu consequat purus metus eu velit.</p> 

    <p>Proin metus odio, aliquam eget molestie nec, gravida ut sapien. Phasellus quis est sed turpis sollicitudin venenatis sed eu odio. Praesent eget neque eu eros interdum malesuada non vel leo. Sed fringilla porta ligula egestas tincidunt. Nullam risus magna, ornare vitae varius eget, scelerisque a libero. Morbi eu porttitor ipsum. Nullam lorem nisi, posuere quis volutpat eget, luctus nec massa. Pellentesque aliquam lacinia tellus sit amet bibendum. Ut posuere justo in enim pretium scelerisque. Etiam ornare vehicula euismod. Vestibulum at risus augue. Sed non semper dolor. Sed fringilla consequat velit a porta. Pellentesque sed lectus pharetra ipsum ultricies commodo non sit amet velit. Suspendisse volutpat lobortis ipsum, in scelerisque nisi iaculis a. Duis pulvinar lacinia commodo. Integer in lorem id nibh luctus aliquam. Sed elementum, est ac sagittis porttitor, neque metus ultricies ante, in accumsan massa nisl non metus. Vivamus sagittis quam a lacus dictum tempor. Nullam in semper ipsum.</p> 

    <p class="ending">Cras a est id massa malesuada tincidunt. Etiam a urna tellus. Ut rutrum vehicula dui, eu cursus magna tincidunt pretium. Donec malesuada accumsan quam, et commodo orci viverra et. Integer tincidunt sagittis lectus. Mauris ac ligula quis orci auctor tincidunt. Suspendisse odio justo, varius id posuere sit amet, iaculis sit amet orci. Suspendisse potenti. Suspendisse potenti. Aliquam erat volutpat. Sed posuere dignissim odio, nec cursus odio mollis et. Praesent cursus, orci ut dictum.</p> 

    <script> 
    $(document).ready(function() { 

     var size = localStorage.getItem('size') || $('p').css('fontSize'); 

      //min font size 
      var min = 9; 

      //max font size 
      var max = 16; 

      //grab the default font size 
      var reset = $('p').css('fontSize'); 

      //font resize these elements 
      var elm = $('p.intro, p.ending'); 
     elm.css({'fontSize': size}); 

      //Increase font size 
      $('a.fontSizePlus').click(function() { 

        //if the font size is lower or equal than the max value 
        if (size<=max) { 

          //increase the size 
          size++; 

          //set the font size 
          elm.css({'fontSize' : size}); 
          localStorage.setItem('size', size); 
        } 

        //cancel a click event 
        return false; 

      }); 

      $('a.fontSizeMinus').click(function() { 

        //if the font size is greater or equal than min value 
        if (size>=min) { 

          //decrease the size 
          size--; 

          //set the font size 
          elm.css({'fontSize' : size}); 
          localStorage.setItem('size', size); 
        } 

        //cancel a click event 
        return false; 

      }); 

      //Reset the font size 
      $('a.fontReset').click(function() { 

        //set the default font size 
        elm.css({'fontSize' : reset}); 
      }); 


    }); 

    //A string replace function 
    function str_replace(haystack, needle, replacement) { 
      var temp = haystack.split(needle); 
      return temp.join(replacement); 
    } 
    </script> 
    </body> 

</html>

来源

2016-12-16 20:22:35 manonthemat

如何在本地存储中存储字体大小

回答

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