语法:array.reduce(function(accumulator,currentValue, currentIndex, array), initialValue); initialValue表示初始值,没有提供这个可选初始值时accumulator取数组第一个值,currentValue取第二个值。 这个回调函数接受四个参数: accumulator:初始值 currentValue:当前值 index:索引 array:数组本身 例如: var arr1=[2,3...
constarray=[];functionaddToArray(value){returnnewPromise((resolve)=>{setTimeout(()=>{array.push(value);resolve();},1000);});}(async()=>{awaitaddToArray(1);console.log(array);// [1]awaitaddToArray(2);console.log(array);// [1, 2]awaitaddToArray(3);console.log(array);// [1...
1//emcc编译指令(注意必须要加--bind)2emcc --bind a.cpp -s EXPORTED_RUNTIME_METHODS=['cwrap','ccall'] -s EXPORTED_FUNCTIONS="['ccall', 'cwrap']" -o a.out.js 3.通过自定义结构体以及value_array 1//c++2structArray2d3{4doublex;5doubley;6};78Array2d EMSCRIPTEN_KEEPALIVE foo(Array...
再看回我正文开头那题的答案,正是运用了函数会自行调用 valueOf 方法这个技巧,并改写了该方法。我们稍作改变,变形如下: functionadd(){ console.log('进入add'); varargs= Array.prototype.slice.call(arguments); varfn= function(){ vararg_fn= Array.prototype.slice.call(arguments); console.log('调用fn'...
0x2AD7D2BB); b = II(b, c, d, a, x[k+9], S44, 0xEB86D391); a = addUnsigned(a, AA); b = addUnsigned(b, BB); c = addUnsigned(c, CC); d = addUnsigned(d, DD); } var tempValue = wordToHex(a) + wordToHex(b) + wordToHex(c) + wordToHex(d); return tempValue....
+ (JSValue*)valueWithDouble:(double)value inContext:(JSContext *)context;+ (JSValue*)valueWithInt32:(int32_t)value inContext:(JSContext *)context;- (NSArray*)toArray; - (NSDictionary *)toDictionary; 在讲类型转换前,我们先了解一下JS这门语言的变量类型。根据ECMAScript(可以理解为JS的标准)...
AccessBuilder::ForFixedArrayElement(PACKED_SMI_ELEMENTS)), enum_indices, index, effect, control); // Load the actual field value. Node* value = effect = graph()->NewNode(simplified()->LoadFieldByIndex(), receiver, key...
add(features) 添加覆盖物/图层。参数为单个覆盖物/图层,或覆盖物/图层的数组。 参数说明: features ((VectorOverlay | Array<any>)) 覆盖物对象或者数组 getDefaultCursor() 获取地图默认鼠标指针样式 返回值: string: 地图鼠标指针样式 setDefaultCursor(cursor) 设置地图默认鼠标指针样式 参数说明: cursor...
Set to false , to enable font settings from the map's style for these glyph ranges. Note that Mapbox Studio sets this value to false by default. The purpose of this option is to avoid bandwidth-intensive glyph server requests. For an example of this option in use, see Use locally ...
value ,writable,configurable,enumerable访问器属性: get , set注:不能同时设置 value和writable,这两对属性是互斥的 4.拦截对象的两种情况: let obj = {name: '' ,age: '' ,sex: '' }, defaultname = [ "这是姓名默认值1" , "这是年龄默认值1" ,...