JavaScript问答程序
有人能解释一下这个程序的流程吗?在第一部分中,测试、测试状态、问题、选择、选择、chA、chB、chC、正确性是声明的还是测验的价值?还有JavaScript问答程序,javascript,Javascript,有人能解释一下这个程序的流程吗?在第一部分中,测试、测试状态、问题、选择、选择、chA、chB、chC、正确性是声明的还是测验的价值?还有test.innerHTML+=它将添加test和radio的值 <script type="text/javascript"> var quiz = 0, test, test_status, question, choice, choices, chA, chB, chC, correct = 0; var questions = [
test.innerHTML+=
它将添加test和radio的值
<script type="text/javascript">
var quiz = 0,
test, test_status, question, choice, choices, chA, chB, chC, correct = 0;
var questions = [
["What is 36 + 42", "64", "78", "76", "B"],
["What is 7 x 4?", "21", "27", "28", "C"],
["What is 16 / 4?", "4", "6", "3", "A"],
["What is 8 x 12?", "88", "112", "96", "C"]
];
function get(x) {
return document.getElementById(x);
}
function renderQuestion() {
test = get("test");
if (quiz >= questions.length) {
test.innerHTML = "<h2>You got " + correct + " of " + questions.length + " questions correct</h2>";
get("test_status").innerHTML = "Test completed";
quiz = 0;
correct = 0;
return false;
}
get("test_status").innerHTML = "Question " + (quiz + 1) + " of " + questions.length;
question = questions[quiz][0];
chA = questions[quiz][1];
chB = questions[quiz][2];
chC = questions[quiz][3];
test.innerHTML = "<h3>" + question + "</h3>";
test.innerHTML += "<input type='radio' name='choices' value='A'> " + chA + "<br>";
test.innerHTML += "<input type='radio' name='choices' value='B'> " + chB + "<br>";
test.innerHTML += "<input type='radio' name='choices' value='C'> " + chC + "<br><br>";
test.innerHTML += "<button onclick='checkAnswer()'>Submit Answer</button>";
}
function checkAnswer() {
choices = document.getElementsByName("choices");
for (var i = 0; i < choices.length; i++) {
if (choices[i].checked) {
choice = choices[i].value;
}
}
if (choice == questions[quiz][4]) {
correct++;
}
quiz++;
renderQuestion();
}
window.addEventListener("load", renderQuestion, false);
</script>
var=0,
测试,测试状态,问题,选择,选择,chA,chB,chC,正确=0;
变量问题=[
[“什么是36+42”、“64”、“78”、“76”、“B”],
[“7 x 4是什么?”、“21”、“27”、“28”、“C”],
[“什么是16/4?”、“4”、“6”、“3”、“A”],
[“8 x 12是什么?”、“88”、“112”、“96”、“C”]
];
函数get(x){
返回文档.getElementById(x);
}
函数renderQuestion(){
测试=获取(“测试”);
如果(测验>=问题长度){
test.innerHTML=“您得到了“+问题数+长度数+问题数+正确数”中的“+正确数”;
获取(“测试状态”).innerHTML=“测试完成”;
测验=0;
正确=0;
返回false;
}
获取“+questions.length”的“+test_status”).innerHTML=“Question”+(测验+1)+”;
问题=问题[测验][0];
chA=问题[测验][1];
chB=问题[测验][2];
chC=问题[测验][3];
test.innerHTML=“+问题+”;
test.innerHTML+=“+chA+”
”;
test.innerHTML+=“”+chB+“
”;
test.innerHTML+=“”+chC+“
”;
test.innerHTML+=“提交答案”;
}
函数checkAnswer(){
选项=document.getElementsByName(“选项”);
for(var i=0;i
好的。让我们从我们的工作站开始
var quiz = 0, test, test_status, question, choice, choices, chA, chB, chC, correct = 0;
var questions = [
["What is 36 + 42", "64", "78", "76", "B"],
["What is 7 x 4?", "21", "27", "28", "C"],
["What is 16 / 4?", "4", "6", "3", "A"],
["What is 8 x 12?", "88", "112", "96", "C"]
];
请注意,测验和正确仅为数字。我认为“测验”将是完成问题的计数器,“正确”将是正确问题的计数器。
所有其他变量都没有定义,除了问题,它们有一个非常奇怪的数组结构。显而易见:这是一个只有3个选项的问题列表。每个问题的结构如下:
[" QUESTION ", " OPTION A ", " OPTION B ", " OPTION C ", " CORRECT OPTION "];
所以我认为这是无限的。如果您想添加一些问题,请尝试
让我们继续。在我们的全局变量之后,我们编写一些函数来进行测验。它们是get-按id返回DOM元素-,renderQuestion-显示当前问题-以及检查答案-当有人选择一个选项时所采取的操作。
我认为函数get只是为了清除代码,它不是必需的。让我们跳到下一个,对吗
function renderQuestion(){
test = get("test"); //document.getElementById('test')
if(quiz >= questions.length){
test.innerHTML = "<h2>You got "+correct+" of "+questions.length+" questions correct</h2>";
get("test_status").innerHTML = "Test completed";
quiz = 0;
correct = 0;
return false;
}
get("test_status").innerHTML = "Question "+(quiz+1)+" of "+questions.length;
question = questions[quiz][0];
chA = questions[quiz][1];
chB = questions[quiz][2];
chC = questions[quiz][3];
test.innerHTML = "<h3>"+question+"</h3>";
test.innerHTML += "<input type='radio' name='choices' value='A'> "+chA+"<br>";
test.innerHTML += "<input type='radio' name='choices' value='B'> "+chB+"<br>";
test.innerHTML += "<input type='radio' name='choices' value='C'> "+chC+"<br><br>";
test.innerHTML += "<button onclick='checkAnswer()'>Submit Answer</button>";
}
这将在DOM#test#U状态中打印“问题1/4”。在这里,我们将最终使用未定义的变量:
question = questions[quiz][0];
chA = questions[quiz][1];
chB = questions[quiz][2];
chC = questions[quiz][3];
作为quick=0
,question=“什么是36+42”
,chA=“64”
,chB=“78”
和chC=“76”
。然后,我们准备在DOM测试中打印所有问题:
现在我们有了。但我们选择的价值是什么
for(var i=0; i<choices.length; i++){
if(choices[i].checked){
choice = choices[i].value;
}
}
它验证当前选择的值是否等于当前问题的正确选择。如果是,那么我们的正确问题计数器将增加
quiz++;
renderQuestion();
刚刚结束:我们转到下一个问题,并调用renderQuestion重新开始。当您完成最后一个问题时,renderQuestion函数将在有条件的测验>=questions.length时停止,调用此函数:
test.innerHTML = "<h2>You got "+correct+" of "+questions.length+" questions correct</h2>";
get("test_status").innerHTML = "Test completed";
quiz = 0;
correct = 0;
return false;
当您的窗口准备就绪时,它将为您调用renderQuestion()。您的问题很难理解当前的措辞。
<button onclick='checkAnswer()'>Submit Answer</button>
function checkAnswer(){
choices = document.getElementsByName("choices");
for(var i=0; i<choices.length; i++){
if(choices[i].checked){
choice = choices[i].value;
}
}
if(choice == questions[quiz][4]){
correct++;
}
quiz++;
renderQuestion();
}
choices = document.getElementsByName("choices");
for(var i=0; i<choices.length; i++){
if(choices[i].checked){
choice = choices[i].value;
}
}
if(choice == questions[quiz][4]){
correct++;
}
quiz++;
renderQuestion();
test.innerHTML = "<h2>You got "+correct+" of "+questions.length+" questions correct</h2>";
get("test_status").innerHTML = "Test completed";
quiz = 0;
correct = 0;
return false;
window.addEventListener("load", renderQuestion, false);