javascript如何分割得到经度小数点后6位？

Question

我是 javascript 的新手，正在尝试使用经度坐标。

我有3个经度，我想将它们拆分并存储到小数点后6位

我一次只能做其中一个，这不太好，因为这些数字可以动态地来自用户输入。

例如：

let long1 = 151.21484501290186; // I want to store till 151.214845
let long2 = 77.55814612714227;  // I want to store till 77.558146
let long3 = -122.0898574222976; // I want to store till -122.089857

// this method only works if starting value is of 2 digits but failed when it's 3
const result = long2.toString().substr(long2.toString().indexOf('.') - 2, 9);
console.log(result) // 77.558146

请帮助我。

Answer 1

要获得 6 位小数并保持为浮点数，您可以使用

toFixed

并使用 parseFloat 转换回数字：

parseFloat(number.toFixed(6))

像这样

let longs = [151.21484501290186, // I want to store till 151.214845
 77.55814612714227,  // I want to store till 77.558146
 -122.0898574222976 // I want to store till -122.089857
 ]
 
longs =  longs.map(long => parseFloat(long.toFixed(6)))
console.log(longs)


// or just one of them
const long = 151.21484501290186;
const shorter = parseFloat(long.toFixed(6))
console.log(shorter)

Answer 2

最简单的方法就是使用 toFixed()

let long1 = 151.21484501290186; // I want to store till 151.214845
let long2 = 77.55814612714227;  // I want to store till 77.558146
let long3 = -122.0898574222976; // I want to store till -122.089857

// this method only works if starting value is of 2 digits but failed when it's 3
const result = long2.toString().substr(long2.toString().indexOf('.') - 2, 9);

const result1 = long1.toFixed(6)
console.log(result) // 77.558146
console.log(result1)

javascript如何分割得到经度小数点后6位？

How to split and get till 6 digit after the decimal of logitude in javascript?

javascript

javascript-objects