JavaScript 中从数字中删除尾随零
JavaScript 中要从数字中删除尾随零,请将数字传递给 parseFloat()
函数。 parseFloat
函数解析提供的值,返回一个浮点数,它会自动删除任何尾随零。
const num1 = 13.453000;
const r1 = parseFloat(num1);
console.log(r1); // 👉️ 13.45
// 👇️ if you need to set specific # of decimals
// use the toFixed method
const num2 = 13.453000;
const r2 = parseFloat(num2.toFixed(3));
console.log(r2); // 👉️ 13.453
// 👇️ if the value is a string
const str = '13.453000';
const r3 = parseFloat(str);
console.log(r3); // 👉️ 13.453
在我们的第一个示例中,我们调用了 parseFloat
函数来从数字中去除所有不必要的尾随零。
该函数采用的唯一参数是它解析为浮点数的值。
在第二个示例中,我们对数字使用了 toFixed 方法来显式地将数字设置为小数点后 3 位。
toFixed
方法返回具有指定小数位数的数字的字符串表示形式。
toFixed
方法还会根据需要对数字进行舍入,如果我们指定的小数位数多于数字的小数位数,则用零填充小数部分。
console.log((5).toFixed(2)); // 👉️ '5.00'
console.log((5.346).toFixed(2)); // 👉️ '5.35'
在我们的第三个示例中,我们有一个字符串,我们希望从中删除尾随零。 同样,我们使用 parseFloat
函数将字符串转换为数字。
JavaScript 中的数字会自动删除任何不必要的尾随零,因为 3.00 等于 3。
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