我如何从下面的数组中得到数字

Question

我正在尝试仅针对此阵列中的数字发出警报但不能！提前致谢

var clenk = [0, null, 42, undefined, "", true, false, NaN, "", "foo bar"];
var filteredArr = clenk.filter(function(val) {
return !(val === isNaN);
});
alert(filteredArr);

Answer 1

你可以尝试

＆＃13;

＆＃13;

var clenk = [0, null, 42, undefined, "", true, false, NaN, "", "foo bar"];
var filteredArr = clenk.filter(function(val) {
  return !isNaN(parseFloat(val));
});
alert(filteredArr);

＆＃13;

＆＃13;

＆＃13;

• Why is isNaN() not working

Answer 2

使用typeof运算符检测val的类型。

var clenk = [0, null, 42, undefined, "", true, false, NaN, "", "foo bar"];
var filteredArr = clenk.filter(function(val) {
    return (typeof val === "number" && !isNaN(val));
});
alert(filteredArr);