javaScript-3常用函数

 

 

<!DOCTYPE html>
<html>

<head>
  <table>常用函数</table>
  <meta charset="utf-8">
</head>

<body>
  <h1>Array 数组</h1>
  原始数据： <sapn id="originalArray"></sapn><br />
  slice(1,3) 索引1,2的数据: <span id="sliceoriginalArray"></span><br />
  sort 排序: <span id="sortoriginaArray"></span><br />

  <h1>--时间--</h1>
  当前时间：<span id="spnCurrentDate"></span><br />
  指定时间：<span id="spnTempDate"></span><br />

  <h1>Math 对象用于执行数学任务</h1>
  math.random 随机数 0-1之间<span id="spnRandom"></span><br />
  math.round(9.8) 把一个数字舍入为最接近的整数之间<span id="spnRound"></span><br />
  math.ceil(9.1) 对一个数进行上舍入:<span id="spnCeil"></span><br />
  math.floor(9.8) 返回小于等于x的最大整数:<span id="spnFloor"></span><br />
  math.PI 圆周率<span id="spnPI"></span><br />
  计算eval("2+2*3"):<span id="spnEval"></span>
</body>

<script type="text/javascript">
  var originalArrays = new Array();
  originalArrays[0] = "马超";
  originalArrays[1] = "赵云";
  originalArrays[2] = "刘备";
  originalArrays[3] = "黄忠";
  originalArrays[4] = "张飞";
  originalArrays[5] = "关羽";

  //Date
  var currentDate = new Date();
  document.getElementById("spnCurrentDate").innerText = currentDate;
  var tempDate = new Date();
  tempDate.setFullYear(2028, 08, 08);
  tempDate.setHours(08, 08, 08);
  document.getElementById("spnTempDate").innerText = tempDate;

  var sliceoriginalArrays = originalArrays.slice(1, 3);
  var sortoriginaArrays = JSON.parse(JSON.stringify(originalArrays)).sort()

  document.getElementById("originalArray").innerText = originalArrays.toString();
  document.getElementById("sliceoriginalArray").innerText = sliceoriginalArrays.toString();
  document.getElementById("sortoriginaArray").innerText = sortoriginaArrays.toString();


  document.getElementById("spnRandom").innerText = Math.random();
  document.getElementById("spnRound").innerText = Math.round(9.8);
  document.getElementById("spnCeil").innerText = Math.ceil(9.1);
  document.getElementById("spnFloor").innerText = Math.floor(9.8);
  document.getElementById("spnPI").innerText = Math.PI;
  document.getElementById("spnEval").innerHTML = eval("2+2*3");
</script>

</html>

 

posted @ 2022-09-26 00:09  怪圣卡杰  阅读(15)  评论(0)  编辑  收藏  举报