我怎样才能得到下面的数组中的数字

Question

我想从这个数组中获得只有数字的警报，但不能！在此先感谢

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

Answer 1

您可以尝试

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

• Why is isNaN() not working

Answer 2

使用typeof运营商检测val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);