JS Special character Filter Sample code

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  Code as follows://Match Chinese digit letter underscore         var checkinput = function (str) {      &NBS P     var pattern =var pattern =/^[wu4e00-u9fa5]+$/gi;             if (Pattern.test (c))             {    &N Bsp           return false;                         return true;        }   1.js filter special characters with regular expressions to verify that all input fields contain special symbols The   code is as follows: function Stripscript (s) {  &nbs P var pattern = new RegExp ("[' ~!@#$^&* () =|{} ':; '", [].<>/?~! @#￥......&* ()--| {}【】‘；：”“'。 ，、？ ]         var rs = "";     for (var i = 0; i < s.length i++) {        rs = rs + s.substr (I, 1). replace (pattern , '');    }     return RS;   2. Verify that all input fields contain special symbols   code as follows:/**  * Verify that all input fields contain special symbols  * the symbols to be filtered are written to the regular expression, note that some symbols are used' Escaped.  * Sample:  * if (Checkalltextvalid (document.forms[0))  * alert ("All text boxes in the form pass the checksum!") ");  */function Checkalltextvalid (form) {   //record number of text boxes without quotes     var resulttag = 0;    // Record all text box quantity     var flag = 0;     for (var i = 0; i < form.elements.length i++) {        if (Form.elements[i].type = = "Text" {            flag = flag + 1;            //fill in the filter Special symbols            /Note: Modify ### #处的字符, other parts are not allowed to modify.            //if (/^[^####]*$/.test (form.elements[i].value))         &NB Sp     if (/^[^| "' <>]*$/.test (Form.elements[i].value))                 Resulttag = Resulttag + 1;             else                 form.elements[i].se Lect ();         {   }      /**      * If a text box with quotes is equal to the value of all text boxes, the checksum passes the     &NB sp;*/    if (Resulttag = = flag)         return true;     Else {        alert ("text box cannot contain nn 1 single quotes: ' N 2 double quotes:" N 3 Vertical bars: | N 4 Sharp Corner number: < > NN please check the input! ");         return false;    }}