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Javascript provides the indexof (), lastindexof (), and search () functions for searching substrings in strings, and the Replace () function for strings (), these functions are not implemented in the array object array.
To enable array to support the above methods, I modified the array object prototype and added four functions. These four functions have the same name and syntax as the four corresponding functions of the string object. I will not introduce them much here.
See the example Code :
<HTML> <br/> <pead> <br/> <title> extend Javascript array method </title> <br/> <script language = "JavaScript"> <br/> <! -- <Br/> array. prototype. indexof = function (substr, start) {<br/> var Ta, RT, D = '\ 0'; <br/> If (start! = NULL) {TA = This. slice (start); RT = start;} else {TA = This; RT = 0 ;}< br/> var STR = d + Ta. join (d) + d, t = Str. indexof (D + substr + d); <br/> If (t =-1) Return-1; RT + = Str. slice (0, T ). replace (/[^ \ 0]/g ,''). length; <br/> return RT; <br/>}</P> <p> array. prototype. lastindexof = function (substr, start) {<br/> var Ta, RT, D = '\ 0'; <br/> If (start! = NULL) {TA = This. slice (start); RT = start;} else {TA = This; RT = 0 ;}< br/> Ta = TA. reverse (); var STR = d + Ta. join (d) + d, t = Str. indexof (D + substr + d); <br/> If (t =-1) Return-1; RT + = Str. slice (t ). replace (/[^ \ 0]/g ,''). length-2; <br/> return RT; <br/>}</P> <p> array. prototype. replace = function (Reg, rpby) {<br/> var TA = This. slice (0), D = '\ 0'; <br/> var STR = TA. join (d); STR = Str. replace (Reg, rpby); <br/> return Str. split (d); <br/>}</P> <p> arr Ay. prototype. search = function (REG) {<br/> var TA = This. slice (0), D = '\ 0', STR = d + Ta. join (d) + d, regstr = reg. tostring (); <br/> Reg = new Regexp (regstr. replace (/\/((. | \ n) + )\/. */g, '\ 0 $1 \ 0'), regstr. slice (regstr. lastindexof ('/') + 1); <br/> T = Str. search (REG); If (t =-1) Return-1; return Str. slice (0, T ). replace (/[^ \ 0]/g ,''). length; <br/>}</P> <p> window. onload = function () {<br/> var A = new array ('aa1338521', 'b4323424b', 'cc34 5345 ', 'dd4654', 'dd4654', 'b4323424b'); <br/> document. getelementbyid ('t1 '). value =. tostring (); <br/> document. getelementbyid ('t2 '). value =. indexof ('cc345345'); <br/> document. getelementbyid ('t3 '). value =. lastindexof ('dd4654'); <br/> document. getelementbyid ('t4 '). value =. replace (/\ D/g, '*'); <br/> document. getelementbyid ('t5 '). value =. search (/dd4654/); <br/>}; <br/> // --> <br/> </SCRIPT> <br/> <style type = "t EXT/CSS "> <br/> <! -- <Br/> input {width: 600px} <br/> // --> <br/> </style> <br/> </pead> </P> <p> <body> <br/> <Table> <br/> <tr> <TD> array: </TD> <input id = "T1" type = "text"/> </TD> </tr> <br/> <tr> <TD>. indexof ('cc345345 '): </TD> <input id = "T2" type = "text"/> </TD> </tr> <br/> <tr> <TD>. lastindexof ('dd4654 '): </TD> <input id = "T3" type = "text"/> </TD> </tr> <br/> <tr> <TD>. replace (/\ D/g ,'*'): </TD> <input id = "T4" type = "text"/> </TD> </tr> <br/> <tr> <TD>. search (/dd4654 /): </TD> <input id = "T5" type = "text"/> </TD> </tr> <br/> </table> <br/> </body> <br/> </ptml> <br/>
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