varexp=null;if(typeofexp=="null"){alert("is null");} 为了向下兼容,exp 为 null 时,typeof null 总返回 object,所以不能这样判断。 代码如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 varexp=null;if(isNull(exp)){alert("is null");} 判断字符
*/letstr ='str';alert(typeofabc);//undefined;alert(typeofundefined);//undefinedalert(typeofcheck(str));//undefinedalert(typeof'');//stringalert(typeofstr);//stringalert(typeof98);//numberalert(typeof{});//objectalert(typeofnull);//objectfunctioncheck(value) {if('string'==typeofvalue...
AI代码解释 // no-leak.jsconstheapdump=require('heapdump')classAsync{asyncrun(){returnnull;}}construn=async()=>{for(letindex=0;index<10000000;index++){if(index%1000000===0)console.log(Math.floor(process.memoryUsage().heapUsed/10000),index);constdoer=newAsync();awaitdoer.run();}heapdump...
String对象提供charCodeAt()、fromCharCode()两个方法可以实现ascii与字符间的转换 // 字符转ascii 'a'.charCodeAt(); // ascii转字符 String.fromCharCode('97') 可以搭配eval()函数实现混淆,将字符串转换成代码执行 // 变化前 var aaa ='hello'; console.log(aaa); // 变化后 var test =[10,32,32,32...
function isEmpty(obj){ if(typeof obj == "undefined" || obj == null || obj == ""){ return true; }else{ return false; } } 1. 2. 3. 4. 5. 6. 7. 参考二: if (variable1 !== null || variable1 !== undefined || variable1 !== '') { ...
function checkForm(){ var isPass = true; //过滤字符串 if(!(checkData.isEmptySpan("filterStr") && checkData.filterStrSpan('filterStr','#'))) { isPass = false; } //检查url if(!(checkData.isEmptySpan("isURL") && checkData.isURLSpan('isURL'))) ...
Fix null check. #30694 (@Mugen87) Backend Move trackTimestamp to parent class. #30714 (@s-rigaud) BufferGeometry Fix clone index data copy. #30680 (@s-rigaud) Controls Require element in connect(). #30772 (@mrdoob) Earcut Copy mapbox/earcut file into core libs. #30756 (@gk...
bump checkout and setup-node actions versions 2年前 examples improve yt example 12个月前 lib update todos 4年前 test update tests to work with newer tap version 2年前 .eslintrc.js update performance test to include js 4年前 .gitattributes ...
pure_funcs (default: null)— You can pass an array of names and UglifyJS will assume that those functions do not produce side effects. DANGER: will not check if the name is redefined in scope. An example case here, for instance var q = Math.floor(a/b). If variable q is not used...
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 Success will return: res {Object} ...