var arr = new Array (); Arr[0] = "AAA"; ARR[1] = "BBB"; ARR[2] = "CCC"; alert (arr.length);//3 Arr.pop (); alert (arr.length);//2 Alert (arr[arr.length-1]);//bbb Arr.pop (); Alert (arr[arr.length-1]);//aaa alert (arr.length);//1 var arr2 = new Array (); alert (arr2.length);//0 Arr2[0] = "AAA"; ARR2[1] = "BBB"; alert (arr2.length);//2 Arr2.pop (); alert (arr2.length);//1 ARR2 = Arr2.slice (0,arr2.length-1); alert (arr2.length);//0 Arr2[0] = "AAA"; ARR2[1] = "BBB"; ARR2[2] = "CCC"; ARR2 = Arr2.slice (0,1); alert (arr2.length);//1 Alert (arr2[0]);//aaa Alert (arr2[1]);//undefined Shift: Deletes the first item of the original array and returns the value of the deleted element, or returns undefined if the array is empty var a = [1,2,3,4,5]; var B = A.shift (); a:[2,3,4,5] B:1 Unshift: Adds a parameter to the beginning of the original array and returns the length of the array var a = [1,2,3,4,5]; var B = A.unshift ( -2,-1); a:[-2,-1,1,2,3,4,5] B:7 Note: The test return value under IE6.0 is always undefined,ff2.0 the test return value is 7, so the return value of this method is unreliable, and it is necessary to use splice instead of this method with the return value. Pop: Deletes the last item of the original array and returns the value of the deleted element, or returns undefined if the array is empty var a = [1,2,3,4,5]; var B = A.pop (); a:[1,2,3,4] B:5//No need to return the words directly call it Push: Adds a parameter to the end of the original array and returns the length of the array var a = [1,2,3,4,5]; var B = A.push (6,7); a:[1,2,3,4,5,6,7] B:7 Concat: Returns a new array that adds a parameter to the original array. var a = [1,2,3,4,5]; var B = A.concat (6,7); a:[1,2,3,4,5] b:[1,2,3,4,5,6,7] Splice (Start,deletecount,val1,val2,...) : Deletes the DeleteCount entry from the start position and inserts the Val1,val2 from that location,... var a = [1,2,3,4,5]; var B = A.splice (2,2,7,8,9); a:[1,2,7,8,9,5] b:[3,4] var B = a.splice (0,1); With shift A.splice (0,0,-2,-1); var B = a.length; With Unshift var B = A.splice (a.length-1,1); Same pop A.splice (a.length,0,6,7); var B = a.length; Same push Reverse: Reverse-order the array var a = [1,2,3,4,5]; var B = A.reverse (); a:[5,4,3,2,1] b:[5,4,3,2,1] Sort (orderfunction): Sorting by specified array of parameters var a = [1,2,3,4,5]; var B = A.sort (); a:[1,2,3,4,5] b:[1,2,3,4,5] Slice (Start,end): Returns a new array of items from the original array specifying the start subscript to the end subscript var a = [1,2,3,4,5]; var B = a.slice (2,5); a:[1,2,3,4,5] b:[3,4,5] Join (Separator): Sets the element of an array to a string, separator as a delimiter, and omitted by default with a comma as the delimiter var a = [1,2,3,4,5]; var B = A.join ("|"); a:[1,2,3,4,5] B: "1|2|3|4|5" Then give an array to simulate the Javastringbuffer processing string method: /** * String handler function */ function StringBuffer () { var arr = new Array; This.append = function (str) { Arr[arr.length] = str; }; this.tostring = function () { Return Arr.join (""); Ping append incoming array into a string }; } Today, a join is suddenly found in applications as a good way to convert an array into a string, so it is encapsulated as an object using: /** * Converts an array into a string that is separated by a particular symbol */ function arraytostring (arr,separator) { if (!separator) separator = "";//separator null defaults to NULL return Arr.join (separator); } /** * Find the string contained in the array */ function arrayfindstring (arr,string) { var str = arr.join (""); return Str.indexof (String); } |