Method call of the Array object in JavaScript, javascriptarray

Method call of the Array object in JavaScript, javascriptarray
Method concatfor loop and for in Loop

Join pop shift

Var arr = [,]; var arr2 = [, 4]; alert (arr. join ("-"); alert (arr. pop (); // Delete and return the last element. If the array is empty, // This method does not change the array and returns the undefined value alert (arr. shift (); // Delete and return the first element of the array

Join pop shift push unshift reverse

Var arr = [,]; var arr2 = [, 4]; var arr3 = [0]; alert (arr. join ("-"); alert (arr. pop (); // Delete and return the last element. If the array is empty, // This method does not change the array and returns the undefined value alert (arr. shift (); // Delete and return the first element of the array alert ("push:" + arr3.push )); // 5 add one or more elements to the end of the array and return the new array length alert ("unshift" + arr3.unshift (3, 2 )); // 7 add one or more elements to the beginning of the array, and return the new length of the array alert (arr3); alert (arr3.reverse (); // reverse the order of elements in the array.



Sort

var arr2=[6,8,50,9,5,4];alert(arr2.sort(sortNumber));function sortNumber(a,b){       return a-b}












 
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