JavaScript 的String.prototype.trim()方法可以去掉字符串两端的空白字符。结合其返回值,可以轻松判断字符串是否为空或空白。 functionisEmptyOrWhiteSpace(str){return!str||str.trim().length===0;}// 示例console.log(isEmptyOrWhiteSpace(""));//
“Missing \”use strict\” statement.”:“缺少\”use strict\”的声明”, “Empty block.”:“空的模块”, “Unexpected /*member ‘{a}’.”:“不应出现 /*元素 ‘{a}’.”, “‘{a}’ is a statement label.”:“‘{a}’是一个声明”, “‘{a}’ used out of scope.”:“‘{a}’使...
x=‘string’; x=“string”; (x)=(‘string’); this.x=‘string’; x={‘a’:’string’}.a; [x,y,z]=[‘string1’,’string2’,’string3’]; x=/z(.*)/(‘zstring’)[1]; x=‘string’; x=1?‘string’:0 Using alternative syntax such as these either alone or in conjunction...
“Label ‘{a}’ looks like a javascript url.”:“‘{a}’看上去像一个js的链接”, “Expected an assignment or function call and instead saw an expression”:“需要一个赋值或者一个函数调用,而不是一个表达式.”, “Do not use ‘new’ for side effects.”:“不要用’new’语句.”, “Unneces...
All string methods return a new string. They don't modify the original string. Formally said: Strings are immutable: Strings cannot be changed, only replaced. Thetrim()method removes whitespace from both sides of a string: Example lettext1 =" Hello World! "; ...
有两个用于对值进行分类的运算符:typeof主要用于原始值,而instanceof用于对象。 typeof看起来像这样: typeofvalue 复制 它返回描述value“类型”的字符串。以下是一些示例: >typeoftrue'boolean'>typeof'abc''string'>typeof{}// empty object literal'object'>typeof[]...
“Trailing whitespace.”: “本行末尾有过多无用空格.”, “Script URL.” : “脚本URL.”, “Unexpected {a} in ‘{b}’.” : “在‘{b}’ 中不该出现 {a}.”, “Unexpected ‘{a}’.” : “不该在此出现’{a}’.”, “Strings must use doublequote.” : “字符串需要用双引号”, ...
“Empty class.” : “空的class”, “Expected a number and instead saw ‘{a}’.”:“应该用数字代替’{a}’”, “‘{a}’ should not be greater than ‘{b}’.”:“‘{a}’不应该比’{b}’大”, “‘hasOwnProperty’ is a really bad name.”: “‘hasOwnProperty’是关键字”, ...
Replacing all the white space inside a string is a very common need.For example I last used this inside an API endpoint that received an image. I used the original image name to store it, but if it contained a space it was breaking my functionality (or other special chars, but let’s...
.found[getter]- is this document empty? .docs[getter]get term objects as json .length[getter]- count the # of characters in the document (string length) .isView[getter]- identify a compromise object .compute()- run a named analysis on the document ...