<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
function testDate(){
/**
* 测试Date对象
*/
var date = new Date();
console.log(date.getFullYear());
console.log(date.getYear());
console.log(date.getMonth());
console.log(date.getDay());
console.log(date.getDate());
console.log(date.getHours());
console.log(date.getMinutes());
console.log(date.getSeconds());
console.log(date.getMilliseconds());
}
function testString(){
var s = "this is a STRING test";
//穿件一个锚点 <a name="is">this is a string test</a>
//document.write(s.anchor("is"));
console.log(s.anchor("is"));
console.log(s.charAt(2));
console.log(s[2]);
console.log(s.charCodeAt(2));
console.log(s.concat(",this","is "));
//返回的是 第一个与它匹配的字符串的位置
console.log(s.indexOf("is",8)) //第二个参数 表示 查找的其实位置
console.log(s.replace("is",function (){
return "tttt"; //用函数处理 返回值
}));
console.log(s.substr(1,2)); //长度 包含末尾
console.log(s.substring(1,2)); //位置 不包含末尾
console.log(s.toLowerCase());
console.log(s.toUpperCase());
//字符串可以当作数组使用
s[2] = "tttt";
console.log(s);
for(var i in s){
console.log(s[i]);
}
}
function testMath(){
console.log(Math.abs("-10"));
console.log(Math.ceil(-1.2));
console.log(Math.floor(-1.2));
console.log(Math.max(1,2,.43,123,21,3,1,4,2,5,7,8));
console.log(Math.min(1,2,.43,123,21,3,1,4,2,5,7,8))
//在计算金融的时候 一定要适当的将大单位换成小单位计算
var n1 = 0.2-0.1;
var n2 = 0.3-0.2;
console.log(n1===n2);
}
</script>
</head>
<body>
<input type="button" onclick="testDate()" value="date">
<input type="button" onclick="testString()" value="string">
<input type="button" onclick="testMath()" value="math">
</body>
</html>