// 对象isEmptyStr({})// falseisEmptyStrV2({})// true// 布尔isEmptyStr(false)// falseisEmptyStrV2(false)// true// 数值isEmptyStr(1)// falseisEmptyStrV2(1)// true 出现这种情况的原因是入参可能并不是字符串,所以上面函数isEmptyStrV2()的结果是错误的,isEmptyStr()的结果是对的,但是使...
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StringUtils里的isEmpty方法和isBlank方法的区别 isEmpty() public static boolean isEmpty(String str) { return str == null || str.length()...return true; } else { return true; } } 结论 通过以上代码对比我们可以看出: 1.isEmpty...2.isBlank 是在 isEmpty 的基础上进行了为空(字符串都为空格、...
goodEmptyCheck(new String()); // false ✅ goodEmptyCheck(new Number()); // false ✅ goodEmptyCheck(new Boolean()); // false ✅ goodEmptyCheck(new Array()); // false ✅ goodEmptyCheck(new RegExp()); // false ✅ goodEmptyCheck(new Function()); // false ✅ goodEmptyChe...
console.log(stringIterator.next());//{value:'a',done:false}console.log(stringIterator.next());//{value:'b',done:false}console.log(stringIterator.next());//{value:'c',done:false}console.log(stringIterator.next());//{value:undefined,done:true} ...
C: 0, '', new Boolean(false), undefined D: 所有都是假值 答案: AJavaScript中只有6个假值: undefined null NaN 0 '' (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); ...
false 0 "" (empty string) null undefined NaNHere are examples of boolean context:if condition evaluation if (myVar) {}myVar can be any first-class citizen (variable, function, boolean) but it will be casted into a boolean because it's evaluated in a boolean context....
String: aa string Undefined:undefined undefined Null: null object 一个空对象指针 Boolean : false boolean Symbol:Symbol(1) symbol Object: Object function [] , {} object NaN number(Number 中的特殊数值) 检测是否是数组: ①Array.isArray([])②[] instanceof Array③ [].constructor ==...
var str = "不能包含非法字符" + filterString; this.appendError(id, str); return false; } else { this.remove(id + idExt); return true; } } /** * 检查是否为网址 * * @param {} * str_url * @return {Boolean} true:是网址,false:不是网址; */ this.is...
It defaults to no referrer (which reflects as the empty string). contentType affects the value read from document.contentType, as well as how the document is parsed: as HTML or as XML. Values that are not a HTML MIME type or an XML MIME type will throw. It defaults to "text/html"...