13518219792
function Math(){};
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Math.prototype=new Object();
/**
* Property E
* @memberOf Math
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.E=0;
/**
* Property LN10
* @memberOf Math
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.LN10=0;
/**
* Property LN2
* @memberOf Math
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.LN2=0;
/**
* Property LOG2E
* @memberOf Math
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.LOG2E=0;
/**
* Property LOG10E
* @memberOf Math
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.LOG10E=0;
/**
* Property PI
* @memberOf Math
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.PI=0;
/**
* Property SQRT1_2
* @memberOf Math
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.SQRT1_2=0;
/**
* Property SQRT2
* @memberOf Math
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.SQRT2=0;
/**
* function abs(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.abs=function(x){return 0;};
/**
* function acos(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.acos=function(x){return 0;};
/**
* function asin(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.asin=function(x){return 0;};
/**
* function atan(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.atan=function(x){return 0;};
/**
* function atan2(x,y)
* @memberOf Math
* @param {Number} x
* @param {Number} y
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.atan2=function(x,y){return 0;};
/**
* function ceil(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.ceil=function(x){return 0;};
/**
* function cos(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.cos=function(x){return 0;};
/**
* function exp(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.exp=function(x){return 0;};
/**
* function floor(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.floor=function(x){return 0;};
/**
* function log(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.log=function(x){return 0;};
/**
* function max(arg)
* @memberOf Math
* @param {Number} args
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.max=function(args){return 0;};
/**
* function min(arg)
* @memberOf Math
* @param {Number} args
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.min=function(args){return 0;};
/**
* function pow(x,y)
* @memberOf Math
* @param {Number} x
* @param {Number} y
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.pow=function(x,y){return 0;};
/**
* function pow()
* @memberOf Math
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.random=function(){return 0;};
/**
* function round(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.round=function(x){return 0;};
/**
* function sin(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.sin=function(x){return 0;};
/**
* function sqrt(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.sqrt=function(x){return 0;};
/**
* function tan(x)
* @memberOf Math
* @param {Number} x
* @type Number
* @returns {Number}
* @since Standard ECMA-262 3rd. Edition
* @since Level 2 Document Object Model Core Definition.
*/
Math.tan=function(x){return 0;};
肯定是有一点关系的 但是涉及的知识点不大 简单的函数写多了就会理解 有些复杂的直接调用就可以了
JS中Math函数的常用方法
Math是数学函数，但又属于对象数据类型typeof Math= ‘object’
console.dir(Math)查看Math的所有函数方法。
1，Math.abs()获取绝对值
Math.abs(-12) = 12
2，Math.ceil() and Math.floor()向上取整和向下取整
console.log(Math.ceil(12.03));//13
console.log(Math.ceil(12.92));//13
console.log(Math.floor(12.3));//12
console.log(Math.floor(12.9));//12
3，Math.round()四舍五入
注意：正数时，包含5是向上取整，负数时包含5是向下取整。
1、Math.round(-16.3) = -16
2、Math.round(-16.5) = -16
3、Math.round(-16.51) = -17
4，Math.random()取[0,1)的随机小数
案例1：获取[0,10]的随机整数
console.log(parseInt(Math.random()*10));//未包含10
console.log(parseInt(Math.random()*10+1));//包含10
案例2：获取[n,m]之间的随机整数
Math.round(Math.random()*(m-n)+n)
5，Math.max() and Max.min()获取一组数据中的最大值和最小值
console.log(Math.max(10,1,9,100,200,45,78));
console.log(Math.min(10,1,9,100,200,45,78));
6，Math.PI获取圆周率π 的值
console.log(Math.PI);
7，Math.pow() and Math.sqrt()
Math.pow()获取一个值的多少次幂
Math.sqrt()对数值开方
Math.pow(10，2) = 100;
Math.sqrt(100) = 10;
