![js中有["1","2","3","4"]这样一个string，怎么把它变成array](/aiimages/js%E4%B8%AD%E6%9C%89%5B%26quot%3B1%26quot%3B%2C%26quot%3B2%26quot%3B%2C%26quot%3B3%26quot%3B%2C%26quot%3B4%26quot%3B%5D%E8%BF%99%E6%A0%B7%E4%B8%80%E4%B8%AAstring%EF%BC%8C%E6%80%8E%E4%B9%88%E6%8A%8A%E5%AE%83%E5%8F%98%E6%88%90array.png)
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
.div_bor{
border:1px solid #274b8b
padding: 5px 5px 10px 5px
}
</style>
</head>
<body>
<div class="div_bor">
<p>这是题目</p>
<p><input type="checkbox" value="A">A.选项1</p>
<p><input type="checkbox" value="B">B.选项2</p>
<p><input type="checkbox" value="C">C.选项3</p>
<p><input type="checkbox" value="D">D.选项4</p>
<p><input type="checkbox" value="E">E.选项5</p>
<p><button style="float: right" onclick="fn()">确定</button></p>
</div>
<script>
var rule = ['A','C','D']//答案
var boxs = document.getElementsByTagName('input')
var check = []
var score = 0
function fn(){
check=[]
score = 0
for(var i=0i<boxs.lengthi++){
if(boxs[i].checked){
check.push(boxs[i].value)
}
}
for(var j=0j<check.lengthj++){
if(rule.indexOf(check[j]) !=-1){
score++
}else{
score--
}
}
alert(Math.ceil(100/rule.length*score)+'分')// 分数规则,自己定吧
}
</script>
</body>
</html>
<!doctype html><html lang="en">
<head>
<meta charset="UTF-8">
<style>
.div_bor{
border:1px solid #274b8b
padding: 5px 5px 10px 5px
}
</style>
</head>
<body>
<div class="div_bor">
<p>这是题目</p>
<p><input type="checkbox" value="A">A.选项1</p>
<p><input type="checkbox" value="B">B.选项2</p>
<p><input type="checkbox" value="C">C.选项3</p>
<p><input type="checkbox" value="D">D.选项4</p>
<p><input type="checkbox" value="E">E.选项5</p>
<p><button style="float: right" onclick="fn()">确定</button></p>
</div>
<script>
var rule = ['A','C','D']//答案
var boxs = document.getElementsByTagName('input')
var check = []
var score = 0
function fn(){
check=[]
score = 0
for(var i=0i<boxs.lengthi++){
if(boxs[i].checked){
check.push(boxs[i].value)
}
}
for(var j=0j<check.lengthj++){
if(rule.indexOf(check[j]) !=-1){
score++
}else{
score--
}
}
alert(Math.ceil(100/rule.length*score)+'分')// 分数规则,自己定吧
}
</script>
</body>
</html>
