Result Size: 625 x 534
×
Change Orientation Change Theme, Dark/Light
​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>单击按钮检查数组中的所有答案值是否相同。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
var survey = [
  { name: "Steve",   answer: "Yes"},
  { name: "Jessica", answer: "Yes"},
  { name: "Peter",   answer: "Yes"},
  { name: "Elaine",  answer: "No"}
];
​
function isSameAnswer(el,index,arr) {
  // 不要测试第一个数组元素，因为你没有什么可比较的
  if (index === 0){
    return true;
  }
  else {
  //每个数组元素的值是否与前一个数组元素的值匹配
    return (el.answer === arr[index - 1].answer);
  }
}
​
function myFunction() {
  document.getElementById("demo").innerHTML = survey.every(isSameAnswer);
}
</script>
​
</body>
</html>
​
​