JS基礎語法----Math對象

1.     實例對象: 通過構造函數創建出來,實例化的對象
2.     靜態對象: 不需要創建,直接就是一個對象,方法(靜態方法)直接通過這個對象名字調用
3.     實例方法必須通過實例對象調用
4.     靜態方法必須通過大寫的對象調用

   console.log(Math.PI);
   console.log(Math.E);

   console.log( Math.abs('-1'));//1

   console.log( Math.abs(-2));//2
   console.log(Math.abs(null));//---------0  重點
   console.log(Math.abs("string"));//NaN

   console.log(Math.ceil(12.3));
   console.log(Math.ceil(12.9));
   console.log(Math.ceil(12.09));
   console.log(Math.ceil(12.03));
   console.log(Math.ceil(12.92));

   console.log(Math.floor(12.3));
   console.log(Math.floor(12.9));
   console.log(Math.floor(12.09));
   console.log(Math.floor(12.03));
   console.log(Math.floor(12.92));

   console.log(Math.fround(2));
   console.log(Math.fround(2.1));
   console.log(Math.fround(2.9));

    //找一坨數字中的最大值
   console.log(Math.max(10,1,9,100,200,45,78));
   console.log(Math.min(10,1,9,100,200,45,78));
   
   console.log(Math.pow(2,4));
   console.log(Math.sqrt(16));

    console.log(parseInt(Math.random()*5)+1);
    console.log(parseInt(Math.random()*100)+1);