Javascript Math.min/max.apply设置值为新范围的百分比
我有一个数组值列表Javascript Math.min/max.apply设置值为新范围的百分比,javascript,math,range,Javascript,Math,Range,我有一个数组值列表 var v=[0.009865,0.009866,0.009309,0.009831,0.009919,0.009965,0.009806,0.009509,0.009731,0.009888]; 我计算了最小值、最大值以及两者之间的差值,以确定范围 var max=Math.max.apply(this,v)/100; var min=Math.min.apply(this,v)/100; var dif=max-min; console.dir({'max':max,
var v=[0.009865,0.009866,0.009309,0.009831,0.009919,0.009965,0.009806,0.009509,0.009731,0.009888];
我计算了最小值、最大值以及两者之间的差值,以确定范围
var max=Math.max.apply(this,v)/100;
var min=Math.min.apply(this,v)/100;
var dif=max-min;
console.dir({'max':max,'min':min,'dif':dif});
console.dir显示
max: 0.00009965
min: 0.00009308999999999999
dif: 0.000006560000000000005
然后我循环遍历每个值,试图将它们转换为范围内的百分比
(通过找出当前值比最小值大多少,将答案除以dif并将结果乘以100得到百分比)
我做错了什么
我的数学参考:设置
max
和min
时,不要除以100
:
var max=Math.max.apply(this,v);
var min=Math.min.apply(this,v);
输出:
84.7560975609757
84.90853658536585
0
79.57317073170726
92.9878048780489
100
75.76219512195132
30.487804878048845
64.32926829268297
88.26219512195112
设置
max
和min
时,不要除以100
:
var max=Math.max.apply(this,v);
var min=Math.min.apply(this,v);
输出:
84.7560975609757
84.90853658536585
0
79.57317073170726
92.9878048780489
100
75.76219512195132
30.487804878048845
64.32926829268297
88.26219512195112
您可以使用
Array.map
,例如:
var v= [0.009865,0.009866,0.009309,0.009831,0.009919,0.009965,
0.009806,0.009509,0.009731,0.009888]
,vv= v.map( function (a) {
return ( ( Math.abs(a-this.min) / this.diff() )*100 )
.toFixed(2);
},
{min: Math.min.apply(null, v),
max: Math.max.apply(null, v),
diff: function () { return this.max-this.min; } }
);
// => returns vv
// ["84.76", "84.91", "0.00", "79.57", "92.99", "100.00",
// "75.76", "30.49", "64.33", "88.26"]
在
Array.prototype.map
上,您可以使用Array.map
,类似于:
var v= [0.009865,0.009866,0.009309,0.009831,0.009919,0.009965,
0.009806,0.009509,0.009731,0.009888]
,vv= v.map( function (a) {
return ( ( Math.abs(a-this.min) / this.diff() )*100 )
.toFixed(2);
},
{min: Math.min.apply(null, v),
max: Math.max.apply(null, v),
diff: function () { return this.max-this.min; } }
);
// => returns vv
// ["84.76", "84.91", "0.00", "79.57", "92.99", "100.00",
// "75.76", "30.49", "64.33", "88.26"]
在
Array.prototype.map
上,你能给出一个与我的问题无关的函数吗?当你设置max
和min
时,为什么要除以100?这就是问题所在。为什么循环从01
开始而不是从零开始?@T.J.Crowder:可能是错误的(应该是Math
),但是它是不相关的,因为min
和max
不关心。你能在一个函数中给出与我的问题无关的一切吗?当你设置max
和min
时,为什么要除以100?这就是问题所在。为什么你的循环从01
开始而不是从零开始?@T.J.Crowder:这可能是错误的(应该是Math
),但它是不相关的,因为min
和max
不在乎