functioncheckNullObj(obj){if(Object.keys(obj).length===0){returnfalse// 如果为空,返回false}returntrue// 如果不为空,则会执行到这一步,返回true} 但这样写,还是太累赘了。可以写成这样: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 functioncheckNullObj(obj){returnObject.keys(obj).length==...
constisEmpty= (obj) => {if(Object.prototype.toString.call(obj) ==='[object Object]') {returnObject.keys(obj).length===0; }else{console.warn(`Your input data is not an object`);returnfalse; } }isEmpty({});// trueisEmpty(newDate());// false constisObjectEmpty= (objectName) =...
//激活前的提示 var act_before_tip = function (data) { //非空判断 if (Object.keys(data)...buttons: Ext.Msg.OK, icon: Ext.Msg.INFO ...
apiCheck.object.nullOk({}); // <-- pass apiCheck.object.nullOk([]); // <--- false apiCheck.object.nullOk(null); // <-- passemptyObject *Not available in React's propTypesapiCheck.emptyObject({}); // <-- pass apiCheck.emptyObject([]); // <-- fail apiCheck.emptyObject(null...
从是否有 Empty 情况来看,PACKED > HOLEY 的性能,Benchmark 测试结果大概快 23%。 从类型来看,SMI > DOUBLE > 空类型。原因是类型决定了数组每项的长度,DOUBLE 类型是指每一项可能为 SMI 也可能为 DOUBLE,而空类型的每一项类型完全不可确认,在长度确认上会花费额外开销。 因此,HOLEY_ELEMENTS 是性能最差的兜底...
target.IsEmpty()) { // target_ 是持久句柄,保存对传入的 JS 的对象 Channel 的引用 target_.Reset(env->isolate(), target); if (reference_count_ == 0) { // 如果只有 target_ 引用 channel 对象,则该 channel 对象可以被 GC target_.SetWeak(); } } } WeakReference 继承SnapshotableObject,...
Delete an empty bucket.parameters:name {String} bucket name If bucket is not empty, will throw BucketNotEmptyError. If bucket is not exists, will throw NoSuchBucketError. [options] {Object} optional parameters [timeout] {Number} the operation timeout ...
Node* check = graph()->NewNode( simplified()->BooleanNot(), graph()->NewNode(simplified()->ReferenceEqual(), enum_indices, jsgraph()->EmptyFixedArrayConstant())); effect = graph()->NewNode( simplified()->CheckIf(...
Pass an object to specify custom mangle property options. module (default: true)— process input as ES module, i.e. implicit "use strict"; and support for top-level await. When explicitly specified, also enables toplevel. nameCache (default: null)— pass an empty object {} or a ...
Local<Object> js_options = args[0]->ToObject(env->context()).ToLocalChecked(); ... // options.env Local<Value> env_v = js_options->Get(context, env->env_pairs_string()).ToLocalChecked(); if (!env_v.IsEmpty() && env_v->IsArray()) { ...