$（document）.ready（function（）{Uncaught ReferenceError：$未定义 [英] $(document).ready(function(){ Uncaught ReferenceError: $ is not defined

问题描述

您好我在使用以下代码时遇到未捕获的ReferenceError：$未定义

Hi I am having a "Uncaught ReferenceError: $ is not defined" while using bellow codes

我目前在日志中收到以下错误。我一直在看框架中的示例，我似乎无法找到错误的位置。自从我做了任何HTML或js以来已经过去了十多年，我当时所做的就是非常基本的东西。任何帮助将不胜感激

I am currently getting the following error in my log. I have been looking at the samples in the framework and I just can't seem to find where the error is. It's been over a decade since I have done any HTML or js and what I did back then was very basic stuff. Any help would be appreciated

<script type="text/javascript">
var sQuery = '<?php echo $sQuery; ?>';

$(document).ready(function(){
    if($('input[name=sPattern]').val() == sQuery) {
        $('input[name=sPattern]').css('color', 'gray');
    }
    $('input[name=sPattern]').click(function(){
        if($('input[name=sPattern]').val() == sQuery) {
            $('input[name=sPattern]').val('');
            $('input[name=sPattern]').css('color', '');
        }
    });
    $('input[name=sPattern]').blur(function(){
        if($('input[name=sPattern]').val() == '') {
            $('input[name=sPattern]').val(sQuery);
            $('input[name=sPattern]').css('color', 'gray');
        }
    });
    $('input[name=sPattern]').keypress(function(){
        $('input[name=sPattern]').css('background','');
    })
});
function doSearch() {
    if($('input[name=sPattern]').val() == sQuery){
        return false;
    }
    if($('input[name=sPattern]').val().length < 3) {
        $('input[name=sPattern]').css('background', '#FFC6C6');
        return false;
    }
    return true;
}
</script>

推荐答案

它好像你没有导入 jquery 。这些$函数附带了这个非标准（但非常有用）的库。

It seems you don't import jquery. Those $ functions come with this non standard (but very useful) library.

在那里阅读教程： http://docs.jquery.com/Tutorials:Getting_Started_with_jQuery
首先介绍如何导入库。

Read the tutorial there : http://docs.jquery.com/Tutorials:Getting_Started_with_jQuery It starts with how to import the library.

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