Vue Js Check if String is Empty:In Vue.js, you can check if a string is empty using the v-if directive along with the trim method. The trim method removes any whitespace from the beginning and end of the string,
functiontestuser(){vari=document.getElementByIdx_x("aa");if(i.value=="null"){alert("请登录后再发表留言!")returnfalse;}else{alert(i.value)returntrue;}} 参考五: 方法一: 使用trim() 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /* 使用String.trim()函数,来判断字符串是否全为空*/fu...
/* 使用正则表达式来判断字符串是否全为空 */functionkongge2(test) {if(test.match(/^\s+$/)){console.log("all space or \\n"); }if(test.match(/^[ ]+$/)){console.log("all space") }if(test.match(/^[ ]*$/)){console.log("all space or empty") }if(test.match(/^\s*$/))...
file){ if (ObjectUtils.isEmpty(file) || file.getSize() <= 0) { throw new SystemException("上传文件大小为空 7.4K10 JavaScript中为空判断 JavaScript和Java不一样的地方是,Java中判断是否为空只要判断是否等于null就可以了,可是在JavaScript中却不能这样,因为还存在在这另外的几种情况。...下面看看具体...
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 !== '') { ...
Check if input is undefined, null, or an empty string, object, array or Error. In case of Error the input.message and Object.keys( input ) are checked.paramtypedescription level string Either fail or warn what string Text to prepend to check result input mixed The variable to check...
Default to empty string for clip name. #30666 (@s-rigaud) AsciiEffect Avoid useless split operations. #30667 (@s-rigaud) Fix values types. #30710 (@s-rigaud) CSMShader Add missing getPointShadow() argument. #30771 (@brentyi) EXRLoader Fix string comparison. #30709 (@s-rigaud) ...
'' (empty string) false 函数构造函数,如new Number和new Boolean都是真值。36. 【typeof】下面代码的输出是什么? console.log(typeof typeof 1); A: "number" B: "string" C: "object" D: "undefined" 答案: Btypeof 1 返回"number".typeof "number" 返回"string"37...
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'))) ...
If you don't use therecommendedconfiguration, you need to declare the plugin manually in thepluginsfield. Enable or disable rules using therulesfield: importsonarjsfrom'eslint-plugin-sonarjs';exportdefault[{plugins:{sonarjs},rules:{'sonarjs/no-implicit-dependencies':'error',},},]; ...