JavaScript some functions not supported under IE summary

    // ============   isarray  ===============//                  //  isarray       function  IsArray (value) {          return Object.prototype.toString.call (value) = = "[Object] Array] ";      }       var arr = [1,2,3,4,5];       // IE8 and below are not  supported

  //============ Filter and other ===============//    //Some methods of array every (), filter (), ForEach (), map (), some ()    //IE8 and below are not supported    //solution, take filter as an example and write a filter    if(!Array.prototype.filter) {Array.prototype.filter=function(Fun/*, Thisp*/){              varLen = This. Length; if(typeofFun! = "function"){                  Throw NewTypeError (); }              varres =NewArray (); varThisp = arguments[1];  for(vari = 0; i < Len; i++){                  if(Iinch  This){                      varval = This[i];//In case fun mutates this                    if(Fun.call (Thisp, Val, I, This) {Res.push (val); }                  }              }              returnRes;      }; }            varnumbers = [1,2,3,4,5,6]; varFilterresult = Numbers.filter (function(item, Inde, array) {return(item>2);      }); alert (Filterresult); //3,4,5,6

        //  ============   Date.now ()  ===============//       //  date.now (); IE8 and below do not support, can only write a  solution    if(! ) Date.now) {          function() {              returnnew  Date (). ValueOf ();          }      }      Alert (Date.now ());        

 //  ============ stringvalue[1] ============    ===// //  show IE7 in undefined and the following versions       var  stringvalue = "Hello World" ;        Alert (stringvalue[ 1   

        // ============   trim ()  ===============//      //  in IE8 and the following versions are invalid and need     to be written by yourself    function() {          returnthis. Replace (/(^\s*) (\s*$)/g, "") ;      };             var stringValue2 = "   Hello world  ";      Alert (Stringvalue2.trim ());  

JavaScript some functions not supported under IE summary