如何在AngularJS中切片/修剪$ scope变量

问题描述

我是AngularJS的新手，我试图在单击ng-click ="del()"时从变量($ scope.checkTotal)中修剪/切片/删除最后一个字符.

I am new to AngularJS and I am trying to trim/slice/remove the last character from a variable ($scope.checkTotal) when ng-click="del()" is clicked.

也许我的方法是错误的，但到目前为止，我已经尝试过:

Maybe my approach is wrong, but so far I've tried:

$scope.checkTotal.slice($scope.checkTotal, -1);

$scope.checkTotal.substring(0, $scope.checkTotal.length - 1);

$scope.checkTotal.substring(0, length - 1);


.controller('tipController', function($scope) {

  // Numpad
  $scope.checkTotal = '0.00';

  $scope.clicked = function (label) {
    if($scope.checkTotal === '0.00') {
      $scope.checkTotal = label;
    } else {
      $scope.checkTotal += label;
    }
   };

   // Prevent multiple decimals
   $scope.clickedDot = function() {
      if (($scope.checkTotal.indexOf('.') < 0) || ($scope.checkTotal === '0.00')) {
        if ($scope.checkTotal === '0.00') {
          $scope.checkTotal = '0.';
        } else {
          $scope.checkTotal += '.';
        }
      }
  };

   $scope.del = function () {
      $scope.checkTotal.substring(0, length - 1);
   };

});

推荐答案

您的方法是正确的，但是方法切片等待变量(字符串或数组)的长度.也许您可以尝试:

Your approach is correct but the method slice wait the length of your variable (string or array). maybe you can try :

$scope.checkTotal = $scope.checkTotal.slice(0, $scope.checkTotal.length-1);

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