functionisString(obj) { returnobj === obj+'' } 2、判断布尔类型 1 2 3 functionisBoolean(obj) { returnobj === !!obj } 方法五【推荐】: 使用正则来实现,这也是我们最常用的方式 1 2 3 4 5 6 7 functionisNumber(obj) { varreg = /^[0-9]+.?[0-9]*$/; if(reg.test(obj)) { re...
->返回值首先是一个字符串,其次里面包含了对应的数据类型,例如:"number"、"string"、"boolean"、"undefined"、"object"、"function" ->局限性: 1)typeof null ->"object" 2)检测的不管是数组还是正则都返回的是"object",所以typeof不能判断一个值是否为数组 ->console.log(typeof typeof typeof [12, 23...
var aa = 'test string'; alert(typeof aa); // 'string' alert(typeof 90); // 'number' 但是要判断是中文，英文，数字还是字符，那你就只能用正则了。用正则表达式。
2019-12-17 00:09 −1、字符串 在 js 中,字符串为空会有这么几种形式,"",null,undefined,如果在已知变量为空串的情况下可以直接采用 if (string.length == 0) 这种形式,今天总结一下常用的几种方法,方便下次查阅。 1.1、typeof | null | '' 「推荐👉:兼容nu... ...
If the place to copy the object code is a network server, the Corresponding Source may be on a different server (operated by you or a third party) that supports equivalent copying facilities, provided you maintain clear directions next to the object code saying where to find the Corresponding...
( 3 ) === "number" jQuery.type( "test" ) === "string" jQuery.type( function(){} ) === "function" jQuery.type( [] ) === "array" jQuery.type( new Date() ) === "date" jQuery.type( new Error() ) === "error" // as of jQuery 1.9 jQuery.type( /test/ ) === "reg...
Convert the number to a string. Get the first digit, and check that it’s 1. Get the rest of the string, convert it back to a number, and make sure it’s 0 (since the string "0000" converted to a number is 0).If both items 2 and 3 are true, the number is ten-based. If...
// 简单混淆后 eval(function(p,a,c,k,e,r){e=String;if(!''.replace(/^/,String)){while(c--)r[c]=k[c]||c;k=[function(e){return r[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p...
reportIndexNumber选填,sheet 编号,从 0 开始 columnIndexNumber必填,列号,从 0 开始 rowIndexNumber必填,行号,从 0 开始 返回值说明如下表所示: 单元格元素 返回值类型结果 普通文本 取决于单元格值类型 数字(number) 字符串(string) 对应的值 数据列 ...
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