对象就是属性+方法，有点Java的样子，JavaScript有自己的对象，下面我们看看吧
Number
<body>
<script>
var x = new Number(123)
document.write("类型："+typeof(x))
document.write("</br>")
var y = 10
document.write("类型："+typeof(y))
document.write("</br>")
document.write("二进制："+y.toString(2))
document.write("</br>")
document.write("二进制："+y.toString(8))
document.write("</br>")
document.write("二进制："+y.toString(16))
</script>
</body>
字符串
<body>
<script>
var x = new String("张三")
document.write("字符串长度："+x.length)
document.write("</br>")
document.write("返回指定字符串："+x.charAt(0))
document.write("</br>")
var y = new String("李四")
document.write("连接："+x.concat(y))
document.write("</br>")
document.write("字符串第一次出现位置："+x.indexOf("三"))
document.write("</br>")
document.write("字符串最后一次出现位置："+x.lastIndexOf("三"))
document.write("</br>")
document.write("判断字符串是否相等(1表示不相等)："+x.localeCompare(y))
document.write("</br>")
document.write("截取字符串："+x.substring(0,1))
</script>
</body>
数组
<body>
<script>
var x = new Array(5);
var y = new Array(2,4,6,7,9);
for(var i=0;i<y.length; i++){
document.write(y[i])
}
document.write("</br> 长度："+y.length)
</script>
</body>
Date日期
<body>
<script>
var a = new Date();
document.write(a.getFullYear()+"年"+(a.getMonth()+1)+"月"+a.getDate()+"日")
document.write(a.getHours()+"时"+a.getMinutes()+"分"+a.getSeconds()+"秒")
</script>
</body>
Math
<body>
<script>
document.write("圆周率："+Math.PI)
document.write("</br>")
document.write("绝对值："+Math.abs(-1))
document.write("</br>")
document.write("最小："+Math.min(1,100)+"最大："+Math.max(1,100))
document.write("</br>")
document.write("求幂："+Math.pow(3,3))
document.write("</br>")
document.write("求幂："+Math.round(3.4))
</script>
</body>
网友评论