Result Size: 625 x 534
x
 
<!DOCTYPE html>
<html>
<body>
<p>单击该按钮可在字符串中搜索“blue”,并显示匹配的位置。</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
  var str = "Mr. Blue has a blue house"
  var n = str.search("blue");
  document.getElementById("demo").innerHTML = n;
}
</script>
</body>
</html>