代码语言:javascript 代码运行次数:0 运行 AI代码解释 constarr=[100,'B',4,'5',3,'A',0];for(constkeyinarr){console.log(`index:${key}value:${arr[key]}`);}console.log('________\n');functionFoo(){this[100]=100;this.B='B';this[4]=4
避免for-in遍历数组的所有缺陷es5中数组遍历方法 forEach 1array.forEach(function(item, index, arr), thisValue) forEach参数有两个,第一个参数是必填的回调函数,回调函数中有三个参数,分别是:数组的某一项,数组的index,数组本身;第二个参数是可选的上下文参数(也就是this的指向) 这个例子我们看第一个参数...
const arr = [100,'B', 4,'5', 3,'A', 0];for(const keyinarr) { console.log(`index:${key} value:${arr[key]}`);}console.log('___\n');functionFoo() {this[100] = 100;this.B ='B';this[4] = 4;this['5'] ='5';this[3] = 3;this.A ='A';this[0] = 0;}const...
forEach(function(element,index){ console.log(element + '/' + index); }) //输出结果: first/0 second/1 third/2 fourth/3 3/4 5/5 8/6 5.map 遍历数组,并通过callback对数组元素进行操作,并将所有操作结果放入数组中并返回该数组(不能遍历伪数组) var arr = ["first","second",'third' ...
这些内容在前面的章节已经讲过了,遗忘的童鞋记得温故知新呀。 find、findIndex 在编程过程中常常会遇到对象数组,而对象是不能直接使用===比较的,如何从数组中查找到满足条件的对象呢? 这个时候就要使用find和findIndex方法,语法如下: letresult=arr.find(function(itm...
In JavaScript, functions are executed in the order they are called. The call stack follows the Last In, First Out (LIFO) principle, meaning that the last function pushed onto the stack is the first one to be executed.According to the ECMAScript specification, the call stack is defined as ...
setInterval(function(), delay); It takes in two basic parameters, namely – function and the time delay. The function is the set of code to be executed when setInterval() is called. The time to be delayed is given in milliseconds. Hence, for 5 seconds, we need to pass 5000...
To change the toolbar without modifying Trix, you can overwrite the Trix.config.toolbar.getDefaultHTML() function. The default toolbar HTML is in config/toolbar.js. Trix uses data attributes to determine how to respond to a toolbar button click....
Array.prototype.myUnshit=function(){ varlen=this.length; varinLen=arguments.length; for(vari=len-1;i>=0;i--){ // this[0] = arguments[i] this[i+inLen]=this[i] } for(vari=0;i<inLen;i++){ this[i]=arguments[i] } returnthis.length; ...
IoE applications will have varying requirements in terms of bandwidth, latency, and reliability. Network slicing will allow for the creation of virtual networks tailored to the specific needs of different IoE applications, ensuring that they receive the necessary resources to function optimally (Saad et...