Question

我需要帮助过滤掉NaN

var trimmer =[7, "ate", "", false, 9];

var filt = value=> value !==false && value!==''&& value!==undefined&&  
value!==null&&  value!==NaN;


trimmer.filter(filt);

//works for this->[7, "ate", "", false, 9];
//but not for [false, null, 0, NaN, undefined, ""];
//need help filtering out NaN

Answer 1

您可以改用isNan()功能。请点击this link查看更多示例。

Answer 2

NaN是假的（假，未定义，null，＆＃34;＆＃34;，0也是）：

trimmer.filter(e=>e);

Answer 3

NaN == NaN总是会给你错误。

＆＃13;

var trimmer =[false, null, 0, NaN, undefined, ""];
var trimmer1 =[7, "ate", "", false, 9];

var filt = value=> value !==false && value!==''&& value!==undefined&&  
value!==null && value.toString() !== "NaN" && value !== 0;


console.log(trimmer.filter(filt));
console.log(trimmer1.filter(filt));
//works for this->[7, "ate", "", false, 9];
//but not for [false, null, 0, NaN, undefined, ""];
//need help filtering out NaN

＆＃13;

Answer 4

Rohodos简单更改值!= NaN到!isNAN(value)

所以你的代码现在看起来像

var trimmer = [false, null, 0, NaN, undefined, ""];

var filt = value=> value !==false && value!==''&& value!==undefined&&value!==null&& !isNaN(value);

trimmer.filter(filt);

Answer 5

Javascript将0视为false，因此将其过滤。需要检查变量的类型，如果它是数字返回true。

＆＃13;

var trimmer = [false, null, 0, NaN, undefined, ""];

console.log(trimmer.filter(e=>e));

＆＃13;

Answer 6

如果你想特别过滤出NaN但留下其他假名值，那么这将有效：

import Vue from 'vue'
import App from './vue/App.vue'
import Grid from './vue/Grid.vue'
import PatternList from './vue/PatternList.vue'

Vue.component('grid', Grid);
Vue.component('pattern-list', PatternList);

new Vue({
  el: '#app',
  render: h => h(App)
});

如何过滤掉javascripts过滤函数中的NaN

6 个答案: