html javascript全域性函式和Number物件
阿新 • • 發佈:2018-12-26
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <script type="text/javascript" src="js/write.js"></script> <script type="text/javascript"> /*var num1=Math.ceil(12.34); //向上取整 var num2=Math.floor(12.34); //向下取整 var num3=Math.round(12.34); //四捨五入 println(num1); println(num2); println(num3);*/ /*var num4=Math.pow(10,2); //10的平方 //1-10以內的隨機整數 for(var i=1;i<5;i++) { //var num5=parseInt(Math.random()*10+1); //全域性物件的函式 var num5=Math.floor(Math.random()*10+1); println(num5); }*/ /* println(parseInt("123")+1); var val=parseInt("abc"); println(isNaN(val)); //NaN為非法的*/ var num1=parseInt("110",10); println(num1); var num2=parseInt("110",2); //將多少進位制的數轉化為10進位制 println(num2); /*將10進位制轉化為其他進位制,通過Number物件*/ var num3=new Number(6); println(num3.toString(2)); var num4=60; println(num4.toString(16)); </script> </body> </html>