How to remove null values ​​from an array in javascript

Methods to remove null values ​​from arrays: 1. Use the filter method, syntax "array.filter(function (element value, index value, array object), value of this); 2. Use the splice method, syntax " Array object.splice(integer, number of items, new items added to the array)".

The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, Dell G3 computer.

filter filtering method

var arr = ['A', '', 'B', null, undefined, 'C', '  '];
var r = arr.filter(function (s) {
    return s && s.trim(); // 注：IE9(不包含IE9)以下的版本没有trim()方法
});

splice method

function trimSpace(array){  
     for(var i = 0 ;i<array.length;i++)  
     {  
         if(array[i] == " " || array[i] == null || typeof(array[i]) == "undefined")  
         {  
                  array.splice(i,1);  
                  i= i-1;  

         }  
     }  
     return array;  
}

[Recommended learning: javascript advanced tutorial]

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