如何在javascript中乘以数字数组中的值？

Question

var timeCost = [];

var ride_time = 30;

var cost_per_minute = [0.2,0.35,0.4,0.45];

for（let i = 0; i＆lt; cost_per_minute.length; i ++）{

timeCost.push（cost_per_minute [i] * ride_time）

}

的console.log（timeCost）

Answer 1

这与.map()：

更为简洁

let cost_per_minute...
const ride_time = 30;
let timeCost = cost_per_minute.map(x => x * ride_time);

Answer 2

var ride_time = 30;
var cost_per_minute = [0.2, 0.35, 0.4, 0.45]
var timeCost = cost_per_minute.map(function(i){return i* ride_time})
console.log(timeCost)

Answer 3

代码中的两个位置：

for循环的第二部分通常是计数器的条件（即i）小于数组的总数（.ie。cost_per_minute.length）

  

for（var i = 0; i < cost_per_minute.length; i ++）{

数组中元素的语法为nameOfArray[i]，i为变量索引号。

  

timeCost.push（cost_per_minute[i] * ride_time）

}

var timeCost =[];

var  ride_time = 30;

var cost_per_minute = [0.2, 0.35, 0.4, 0.45];

for (let i = 0; i < cost_per_minute.length; i++ ){

  timeCost.push(cost_per_minute[i]*ride_time) 

}


console.log(timeCost)