LESS 编译错误

Posted 2023-03-06

【中文标题】LESS 编译错误

【英文标题】：LESS compile error

【发布时间】：2012-11-11 07:55:03

【问题描述】：

我正在使用 Incident57 的 CodeKit 预处理器来编译一系列被导入并缩小到一个名为 template.css 的 CSS 文件的 less 文件。

但是，在进行了一些编辑之后（我不知道是什么编辑造成的），我开始得到 non_object_property_callError

non_object_property_callError: Cannot call method 'charAt' of null in /Volumes/Clients/htdocs/ergonomiq/domains/clients/polaris5/less/mediaqueries.less:14:2
13  h1 
14      font-size: 100px;
15      margin-bottom: 60px;

template.less 导入 12 个文件：

@import "cssindex.less";
@import "fonts.less";
@import "colors.less";
@import "variables.less";
@import "mixins.less";
@import "base.less";
@import "skeleton.less";
@import "flexslider.less";
@import "prettyPhoto.less";
@import "layout.less";
@import "scrollbars.less";
@import "mediaqueries.less";

另外，fonts.less 本身会导入 5 个文件

@import "font-awesome.less";
@import "font-awesome-ie7.less";
@import "font.bebas.less";
@import "font.leaguegothic.less";
@import "font.sourcesanspro.less";

错误似乎与 media queries.less 文件有关/关联

/* Media Queries CSS File
================================================== */

/* Smaller than 1024 (devices and browsers) */
@media only screen and (max-width: 1024px) 
     .title  
        position: relative;
        padding-top: 110px;
    
    #intro 
        height: 600px;
    
    h1 
        font-size: 100px;
        margin-bottom: 60px;
        &.small 
            font-size: 60px;
            margin-bottom: 20px;
        
    


/* Smaller than 960 (devices and browsers) */
@media only screen and (max-width: 960px) 
    nav 
        ul 
            display: none;
        
    
    .title 
        position: relative;
        padding-top: 50px;
    
    .mobnav 
        position: absolute;
        z-index: 9999;
        top: 0.1em;
        right: 0.1em;
        width: 100px;
        height: 49px;
    
    .mobico 
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: @black;
        color: @white;
        z-index: 9990;
        overflow: hidden;
        a 
            display: block;
            width: 100%;
            text-align: center;
            padding: 20px 0;
            font-family: @baseFontFamily
            font-size: 1.5em;
            color: @gray85;
            font-weight: 300;
            text-decoration: none;
            text-transform: uppercase;
            border-bottom: solid 1px @gray50;
        
    
    .menusel 
        position: absolute;
        z-index: 9999;
        top: 0.7em;
        right: 0.1em;
        width: 40px;
        height: 49px;
    
    nav.is-sticky .mobnav, .mobnav 
        display: inline;
    
    #about 
        -webkit-box-shadow: none;
        -moz-box-shadow: none;
        box-shadow: none;
    



/* Tablet Portrait size to standard 960 (devices and browsers) */
@media only screen and (min-width: 768px) and (max-width: 959px) 
    nav, nav.is-sticky 
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        height: 52px;
    
    .title 
        padding-top: 55px;
    
    .logo1, .menusel, .mobnav, nav .mobnav 
        display: inline;
        z-index: 9999;
        position: fixed;
    
    #intro 
        margin-top: 55px !important;
    
    .logo 
        display: none;
    
    #about 
        -webkit-box-shadow: none;
        -moz-box-shadow: none;
        box-shadow: none;
    


/* All Mobile Sizes (devices and browser) */
@media only screen and (max-width: 767px) 
        .logo 
        display: none;
    


/* Mobile Landscape Size to Tablet Portrait (devices and browsers) */
@media only screen and (min-width: 480px) and (max-width: 767px) 
    #separator1, #separator2, #separator3 
        width: 100%;
        height: 300px;
    
    h1 
        font-size: 70px;
        margin-bottom: 20px;
        &.small 
            font-size: 40px;
            margin-bottom: 20px;
        
    
    .title 
        p 
            font-size: 20px;
            line-height: 28px;
        
    
    nav 
        ul 
            li 
                padding-left: 10px;
                padding-right: 10px;
            
        
    
    nav, nav.is-sticky 
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        height: 52px;
    
    .mobnav, .menusel 
        display: inline;
        z-index: 9999;
        position: absolute;
        top: 0.7em;
        right: 0.1em;
        height: 49px;
    
    .logo1, .menusel, .mobnav, nav .mobnav 
        display: inline;
        z-index: 9999;
        position: fixed;
    
    .intro-line 
        width: 400px;
    
    h2 
        font-size: 3.5em;
        margin-top: 1em;
        margin-bottom: 1em;
    
    #about 
        p 
            margin-top: 1em;
            margin-bottom: 1em;
            word-spacing: 0.4em;
        
    
    .serv-list, .markets-list 
        margin-top: 3em;
        h4 
            margin-bottom: 2em;
            line-height: 1.15em;
        
    


/* Mobile Portrait Size to Mobile Landscape Size (devices and browsers) */
@media only screen and (max-width: 479px) 
    #separator1, #separator2, #separator3 
        width: 100%;
        height: 300px;
    
    #intro 
        height: 430px;
    
    .title 
        position: relative;
        padding-top: 120px;
        p 
            font-size: 18px;
            line-height: 28px;
        
    
    .intro-line 
        display: none;
    
    h1 
        font-size: 60px;
        margin-bottom: 20px;
        &.small 
            font-size: 30px;
            margin-bottom: 20px;
        
    
    h2 
        font-size: 3em;
        margin-top: .5em;
        margin-bottom: .5em;
    
    nav 
        ul 
            li 
                padding-left: 5px;
                padding-right: 5px;
            
        
    
    #about 
        -webkit-box-shadow: none;
        -moz-box-shadow: none;
        box-shadow: none;
    
    #about, #contact, #markets 
        p 
            font-size: 1.25em;
            margin-top: .5em;
            margin-bottom: .5em;
            word-spacing: 0.4em;
        
        .copyright 
            p 
                font-size: .85em;
            
        
    
    nav, nav.is-sticky 
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        height: 52px;
    
    .logo 
        display: none;
    
    .logo1, .menusel, .mobnav, nav .mobnav 
        display: inline;
        z-index: 9999;
        position: fixed;
    
    .serv-list, .markets-list 
        margin-top: 3em;
        h4 
            font-size: 2em;
            margin-bottom: 2em;
            line-height: 1.15em;
        
        .roundness-red, .roundness-blue 
            padding: 1em 0;
            span, i 
                font-size: 2em;
                padding: 1.2em 1.3em;
            
        
        .roundness-purple, .roundness-yellow, .roundness-green 
            padding: 1em 0;
            span, i 
                font-size: 2em;
                padding: 1.2em 1.2em 1.1em 1.2em;
            
        
        p 
            font-size: 1.25em;
            margin-top: 2em;
            margin-bottom: .5em;
        
    
    .contact-info 
        font-size: 1em;
        margin-top: 1em;
    

除此之外，我完全迷失了。

non_object_property_callError: Cannot call method 'charAt' of null 错误是什么意思，如何解决？

任何建议将不胜感激。

【参考方案1】：

LESS 最令人沮丧的地方在于它提供的调试信息帮助不大。

第 57 行缺少一个简单的分号

    a 
        display: block;
        width: 100%;
        text-align: center;
        padding: 20px 0;
        font-family: @baseFontFamily    //missing semicolon
        font-size: 1.5em;
        color: @gray85;
        font-weight: 300;
        text-decoration: none;
        text-transform: uppercase;
        border-bottom: solid 1px @gray50;
    

修正后的代码运行良好

    a 
        display: block;
        width: 100%;
        text-align: center;
        padding: 20px 0;
        font-family: @baseFontFamily;
        font-size: 1.5em;
        color: @gray85;
        font-weight: 300;
        text-decoration: none;
        text-transform: uppercase;
        border-bottom: solid 1px @gray50;