add Math method

xiaojue · Jan 20, 2015 · e45089e · e45089e
1 parent f81c1e4
commit e45089e
Showing 1 changed file with 121 additions and 21 deletions.
diff --git a/es.js b/es.js
@@ -162,7 +162,7 @@
  do {
  if (k in source) {
  value = source[k];
- k += (!!isLeft || -1);
+ k += ( !! isLeft || - 1);
  break;
  }
  index = isLeft ? k + 1: k - 1;
@@ -172,14 +172,18 @@
  }
  while (isLeft ? k < len: k >= 0) {
  if (k in source) value = fun.call(undefined, value, source[k], k, source);
- k += (!!isLeft || -1);
+ k += ( !! isLeft || - 1);
  }
  return value;
  }
 
  var Arr6 = {
- from: function() {},
- of: function() {}
+ from: function() {
+
+ },
+ of: function() {
+
+ }
  };
 
  var ArrPro6 = {
@@ -232,24 +236,120 @@
  toJSON: function() {}
  };
 
+ //http:https://baike.baidu.com/link?url=FVj1cXvzfX11Gnf-0kPD4AAVXZh6l631NaKvU_lGW7tHTjk9JqZqRH0io4to_bna7NLczhfHcbMG0l8b88jW5a 双曲线百科
+ //http:https://baike.baidu.com/view/6688537.htm 反双曲线百科
  var M6 = {
- acosh: function() {},
- asinh: function() {},
- atanh: function() {},
- cbrt: function() {},
- clz32: function() {},
- cosh: function() {},
- expm1: function() {},
- hypot: function() {},
- log2: function() {},
- log10: function() {},
- log1p: function() {},
- sign: function() {},
- sinh: function() {},
- tanh: function() {},
- trunc: function() {},
- imul: function() {},
- fround: function() {}
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/acosh
+ //acosh 函数返回一个数的反双曲余弦。
+ acosh: function(x) {
+ return M.log(x + M.sqrt(x * x - 1));
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/asinh
+ //asinh 函数返回参数的反双曲正弦值
+ asinh: function(x) {
+ if (x === - Infinity) return x;
+ else return M.log(x + M.sqrt(x * x + 1));
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atanh
+ //atanh 返回参数的反双曲正切值
+ atanh: function(x) {
+ return Math.log((1 + x) / (1 - x)) / 2;
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cbrt
+ //cbrt 函数返回 x 的立方根值。这个函数不会失败；任何可表示的实数总有一个可表示的立方根。
+ cbrt: function(x) {
+ var y = Math.pow(Math.abs(x), 1 / 3);
+ return x < 0 ? - y: y;
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/clz32
+ //CountLeadingZeroes32 计算一个数字在32位无符号位整形数字的二进制形式开头有多少个0。
+ clz32: function(x) {
+ var value = Number(x) >>> 0;
+ return value ? 32 - value.toString(2).length: 32;
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cosh
+ //cosh 返回数字的双曲余弦值。
+ cosh: function(x) {
+ var y = Math.exp(x);
+ return (y + 1 / y) / 2;
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/expm1
+ //expm1 计算参数的以 e 为底的指数，减去 1
+ expm1: function(x) {
+ return Math.exp(x) - 1;
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/hypot
+ //hypot 函数计算一直角三角形的斜边长度。
+ hypot: function(x, y) {
+ var r = 0;
+ if (M.abs(x) === Infinity || M.abs(y) === Infinity) return Infinity;
+ r += x * y;
+ return M.sqrt(y);
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log2
+ //log2 计算参数以 2 为底的对数
+ log2: function(x) {
+ return M.log(x) / M.LN2;
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log10
+ //log10 计算参数以 10 为底的对数
+ log10: function(x) {
+ return M.log(x) / M.LN10;
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log1p
+ //log1p 计算参数加1的对数值
+ log1p: function(x) {
+ return Math.log(1 + x);
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign
+ //sign 判断一个数的符号位
+ sign: function(x) {
+ x = + x; // convert to a number
+ if (x === 0 || isNaN(x)) return x;
+ return x > 0 ? 1: - 1;
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sinh
+ //sinh 双曲正弦函数
+ sinh: function(x) {
+ var y = M.exp(x);
+ return (y - 1 / y) / 2;
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/tanh
+ //tanh 双曲线正切函数
+ tanh: function(x) {
+ if (x === Infinity) {
+ return 1;
+ } else if (x === - Infinity) {
+ return - 1;
+ } else {
+ var y = M.exp(2 * x);
+ return (y - 1) / (y + 1);
+ }
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc
+ //trunc 取整函数
+ trunc: function(x) {
+ return x < 0 ? M.ceil(x) : M.floor(x);
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/imul
+ //imul 该函数返回两个参数的类C的32位整数乘法运算的运算结果.
+ imul: function(a, b) {
+ var ah = (a >>> 16) & 0xffff;
+ var al = a & 0xffff;
+ var bh = (b >>> 16) & 0xffff;
+ var bl = b & 0xffff;
+ return ((al * bl) + (((ah * bl + al * bh) << 16) >>> 0) | 0);
+ },
+ //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/fround
+ //fround 将参数中指定的数字转换为离它最近的单精度浮点数形式.
+ fround: function(x) {
+ if (x === 0 || x === Infinity || x === - Infinity || isNaN(x)) {
+ return x;
+ }
+ var num = Num(x);
+ //TODO
+ return numberConversion.toFloat32(num);
+ }
  };
 
  var NumPro5 = {