AI代码解释 /* 使用String.trim()函数,来判断字符串是否全为空*/functionkongge1(test){/* 给String原型链对象添加方法trim */if(!String.prototype.trim){String.prototype.trim=function(){returnthis.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g
Learn how to check if an input field is empty in React using different methods, such as empty string validation, react hook form, and JavaScript. This tutorial will show you how to handle empty field validation in React JS with examples
"string" --- 如果这个值是字符串。 "number" --- 如果这个值是数值。 "object" --- 如果这个值是对象或者null; "function" --- 如果这个值是函数。 */letstr ='str';alert(typeofabc);//undefined;alert(typeofundefined);//undefinedalert(typeofcheck(str));//undefinedalert(typeof'');//string...
alert(typeof null);//object function check(value) { if ('string' == typeof value) { kongge1(value); kongge2(value); } else { console.log(typeof value); console.log('请输入字符串'); } } /* 使用String.trim()函数,来判断字符串是否全为空*/ function kongge1(test) { let str =...
由于JavaScript是弱类型语言,而且JavaScript声明变量的时候并没有预先确定的类型,变量的类型就是其值的类型,也就是说「变量当前的类型由其值所决定」,夸张点说上一秒是String,下一秒可能就是个Number类型了,这个过程可能就进行了某些操作发生了强制类型转换。虽然弱类型的这种「不需要预先确定类型」的特性给我们带来了便...
[d261274b0f] - doc: deprecate passing an empty string to options.shell (Antoine du Hamel) #58564 [510872a522] - (SEMVER-MINOR) doc: graduate Symbol.dispose/asyncDispose from experimental (James M Snell) #58467 [6f4c9dd423] - (SEMVER-MINOR) fs: add autoClose option to FileHandle rea...
(// navigate to a chat app// post a reply to Alice)// Note that invoking actorCalled(name) multiple times// while using the same name and within the scope of a single test// returns the same actor, so you don't need to cache them:awaitactorCalled('Alice').attemptsTo(// check ...
Check out the official example for more information. OrbitControls and MapControls now have a new default value for dampingFactor. WebGLRenderer.context has been removed. Please use WebGLRenderer.getContext() instead. FBXLoader now correctly sets the texture encoding. When using FBX assets in ...
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 ...
Node* check = graph()->NewNode( simplified()->BooleanNot(), graph()->NewNode(simplified()->ReferenceEqual(), enum_indices, jsgraph()->EmptyFixedArrayConstant())); effect = graph()->NewNode( simplified()->CheckIf(...