如果我从这里复制代码：https
://jsfiddle.net/agt10exp/
它在小提琴上工作正常，但是当我在我的电脑上创建一个新文件并将代码粘贴到其中时，我得到相同的布局，但是它是无法正常运行（将<html></html>and添加<script src....></script>到我的代码中：
（Ps 我是 Python 程序员，所以问题可能出在我的 HTML/Js 知识上）
<html>
I am a </span><select name="parent_selection" id="parent_selection">
<option value="">-- Please Select --</option>
<option value="patient">Patient</option>
<option value="doctor">Doctor or physician</option>
<option value="school">School or parent</option>
<option value="worker">Case worker</option>
</select>
<br /><span>and I need information on</span>
<select name="child_selection" id="child_selection" onchange="location = this.options[this.selectedIndex].value;">
</select>
</html>
<!------answer 1: not wokring --------------->
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>
var jq81 = jQuery.noConflict();
jq81(document).ready(function($){
//let's create arrays
var patient = [
{display: "My initial visit", value: "patients#visit" },
{display: "My initial evaluation", value: "patients#visit" },
{display: "My appointments", value: "patients#appointments" },
{display: "Your payment policies", value: "patients#policies" }];
var doctor = [
{display: "Our approach", value: "doctors-and-physicians" },
{display: "Our services", value: "services" },
{display: "Referring patients", value: "patients#visit" }];
var school = [
{display: "Our approach", value: "schools-and-parents" },
{display: "My child's initial evaluation", value: "patients#visit" },
{display: "Setting appointments", value: "patients#appointments" },
{display: "Your payment policies", value: "patients#policies" }];
var worker = [
{display: "Our approach", value: "case-workers" },
{display: "Insurance policies", value: "clients#insurance" },
{display: "Your Payment policies", value: "patients#policies" }];
//If parent option is changed
jq81("#parent_selection").change(function() {
var parent = jq81(this).val(); //get option value from parent
switch(parent){ //using switch compare selected option and populate child
case 'patient':
list(patient);
break;
case 'doctor':
list(doctor);
break;
case 'school':
list(school);
break;
case 'worker':
list(worker);
break;
default: //default child option is blank
jq81("#child_selection").html('');
break;
}
});
//function to populate child select box
function list(array_list)
{
jq81("#child_selection").html(""); //reset child options
jq81(array_list).each(function (i) { //populate child options
jq81("#child_selection").append("<option value=\""+array_list[i].value+"\">"+array_list[i].display+"</option>");
});
}
});
</script>
我看到更多有同样问题的人：
但是，我尝试了解决方案，但我无法弄清楚，我希望有人能帮助我