There is no clear() method available in javascript. You can use following methods to clear arrays
Method 1:
var a = [1,2,3,4];
a = [];
// empty array
Method 2:
var a = new Array(1,2,3,4);
a = new Array();
// reinitialize array
Method 3:
a.length = 0;
Method 4: // recommended
a.splice(0, a.length);