JavaScriptVoidfunction return value is used as the return type of function that does not return any value. Thevoidoperator is often used for obtaining theundefinedprimitive value. void expression Void function return value is used in JavaScript A simple example code describes the returning undefined ...
varjquery =function() {//return new jquery.fn.init();//return new Object();//return 'a'//return {a:1}}; jquery.fn= jquery.prototype ={ constructor: jquery }; jquery.fn.init=function() { }; jquery.fn.init.prototype=jquery.fn;vara =newjquery(); console.log(a); 输出结果如下: ...
Many web pages use JavaScript to perform complex interactions between the user and the page. It is important to know how to execute JavaScript functions from within Internet explorer. The simplest method is to useNavigatewith the prefixjavascript:then the function name. However, this does not give...
var returnValue = window[functionName].apply(this, this.caCall.arguments) this.save(functionName, this.caCall.arguments, returnValue); return returnValue; } } this.save = function(functionName, argumentObject, returnValue) { // prepend item to cache data.unshift({ fname: functionName, arguments...
It wouldn’t sound too obvious but sometimes your function might need to return multiple values. For instance, in one of the applications I’m working on, I have a JavaScript function where I have to calculate two different values and return them.
在nuxt的项目中,引用了ESlint写了一个方法 {代码...} 提示错误Expected to return a value at the end of function 怎么改
一个function 如果没有显式的通过 return 来返回值给其调用者的话,其返回值就是 undefined 。有一个特例就是在使用new的时候。 JavaScript 中的 function 可以声明任意个形式参数,当该 function 实际被调用的时候,传入的参数的个数如果小于声明的形式参数,那么多余的形式参数的值为 undefined 。
return function(scope, element, attr) { scope.$watch(attr.ngShow, function ngShowWatchAction(value){ // <= create watch $animate[toBoolean(value) ? 'removeClass' : 'addClass'](element, 'ng-hide'); }); }; }]; The first parameter ofscope.$watch()is an expression that is taken fr...
valueOptional. The value to be returned. If omitted, it returnsundefined More Examples Calculate the product of two numbers and return the result: // Call a function and save the return value in x: varx = myFunction(4,3); functionmyFunction(a, b) { ...
return 语句的语法格式如下：// 声明函数function函数名（）{...return需要返回的值；}// 调用函数...