How to empty an javascript array?

2018-06-09 00:42:52

var arr = [-3, -34, 1, 32, -100];

How can I remove all items and just leave an empty array?

And is it a good idea to use this?

arr = [];

Thank you very much!

If there are no other references to that array, then just create a new empty array over top of the old one:

array = [];

If you need to modify an existing array—if, for instance, there's a reference to that array stored elsewhere:

var array1 = [-3, -34, 1, 32, -100];
var array2 = array1;

// This.
array1.length = 0;

// Or this.
while (array1.length > 0) {
    array1.pop();
}

// Now both are empty.
assert(array2.length == 0);

其中之一：

var a = Array();
var a = [];

正如你所说：

arr = [];

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