//清空HashMap所有元素 this.map = { }; this.arrayLink = []; }, keySet: function () { //获取Map中所有KEY的数组(Array 6.2K20 【说站】js中insert如何插入节点 js中insert如何插入节点 1、判断位置不能超过边界,即索引不能小于零或大于链表的长度,否则返回false。 2、需要判断索引是否为0。如果索引...
3.1Array.reduce()方法 array.reduce(callback[, initialValue])通过调用callback函数来将数组简化为一个值。 在每次遍历中的callback(accumulator, item[, index[, array]])使用用参数调用的:累加器,当前项,索引和数组本身且应该返回累加器。 经典示例是对数字数组求和: 代码语言:javascript 复制 constnumbers=[2,...
splice 方法可以移除从 start 位置开始的指定个数的元素并插入新元素,从而修改 arrayObj。返回值是一个由所移除的元素组成的新 Array 对象。 要求 版本5.5 Js代码 Array.prototype.clear=function(){ this.length=0; } Array.prototype.insertAt=function(index,obj){ this.splice(index,0,obj); } Array.prototy...
ES5:Array.isArray(value) 兼容性写法: varisArray=Function.isArray||function(o){returntypeofo==='object'&&Object.prototype.toString.call(o)==='[Object Array]';} 数组方法 栈方法(Last-In-First-Out) push() pop() 队列方法(First-In-First-Out) ...
items: T[]): T[]; /** * Inserts new elements at the start of an array, and returns the new length of the array. * @param items Elements to insert at the start of the array. */ unshift(...items: T[]): number; /** * Returns the index of the first occurrence of a value ...
Note that JSON is a first-class citizen in Node.js, so you don’t have to import any module to parse the JSON objects. The collection.insert function inserts the entire JSON document (var pkgs) into the MongoDB collection. MongoDB determines the schema of the object...
reserved (default: [])— Pass an array of identifiers that should be excluded from mangling. Example: ["foo", "bar"]. toplevel (default: false)— Pass true to mangle names declared in the top level scope. Examples: // test.js var globalVar; function funcName(firstLongName, anotherLong...
JsRender template rendering detects whether the data parameter is an array or not. If it’s an array, the return value is the concatenation of the strings that would result from passing each of the individual array items to the render method. So the template will be rendered ...
query(options, function (error, results, fields) { if (error) throw error; /* results will be an array like this now: [{ table1_fieldA: '...', table1_fieldB: '...', table2_fieldA: '...', table2_fieldB: '...', }, ...] */ }); Transactions Simple transaction support...
It's much more safety when you assume that ids are random. And stop to use this function.// If you need to access all worksheets in a loop please look to the next example.constworksheet=workbook.getWorksheet(1);// access by `worksheets` array:workbook.worksheets[0];//the first one; ...