var n = str.replace(“Microsoft”, “W3School”); 9、concat() concat(): 连接两个或多个字符串: var text1 = “Hello”; var text2 = “World”; text3 = text1.concat(" ",text2); //Hello World 10、trim() trim():去掉字符串首尾空格 var str = " Hello World! "; alert(str.trim(...
5.2将多个数组合并成一个数组 array.concat(array1,array2); 6.数组的排序 var arr=[ 2 , 3 , 1 , 4 , 5 ]; // 6.1对arr进行升序排序,结果为12345 arr.sort(); // 6.2对arr进行降序排序,结果为54321 // 有以下两种方式: // 6.2.1先升序排列,再反转数组 // 6.2.2直接使用sort()方法,传入一...
Hello. friends. I am trying to import solc js in react mobx project. But when use code "var solc = require('solc')", i am getting "Type error soljson.cwrap is not function". If anyone know the way to fix or has sample, Please teach me.
经过以上操作以后,再次本地运行,会提示window.signs is not a function,出错的地方是一个 eval 语句,我们去浏览器看一下这个 eval 语句,发现明明是window.sign(),为什么本地就变成了window.signs(),平白无故多了个 s 呢? 18.png 19.png 造成这种情况的原因只有一个,那就是本地与浏览器的环境差异,混淆的...
(1).NaN:即非数值(Not a Number)。任何涉及NaN的操作都会返回NaN,NaN与任何值都不相等 代码语言:javascript 代码运行次数:0 运行 AI代码解释 //判断是否为数字functionisNumber(number){if(!isNaN(number)){returntrue;}else{returnfalse;}} (2). 数值转换: ...
经过以上操作以后,再次本地运行,会提示window.signs is not a function,出错的地方是一个 eval 语句,我们去浏览器看一下这个 eval 语句,发现明明是window.sign(),为什么本地就变成了window.signs(),平白无故多了个 s 呢? 造成这种情况的原因只有一个,那就是本地与浏览器的环境差异,混淆的代码里肯定有环境检...
array.reduce(function(total,currentValue,currentIndex,arr),initialValue) 参数 此处用于根据deviceID去重: // 添加设备handleAddDevices () {this.adevices=this.adevices.concat(this.selectDevices)lethash = {}this.adevices=this.adevices.reduce((item, next) =>{if(!hash[next.deviceID]) { ...
req.on('data', (chunk: Buffer) => { chunks.push(chunk); }); req.on('end', () => { resolve(Buffer.concat(chunks)); }); req.on('error', reject); }); }; ❌ Error message: req.on is not a function vela91 commented Jul 19, 2023 me too, 😮💨 altaf53 commented...
Array.prototype.map =function(callback, thisArg) {var T, A, k;if (this ==null) {throw new TypeError(' this is null or not defined');}var O = Object(this);var len = O.length >>> 0;if (typeof callback !=='function') {throw new TypeError(callback +' is not a function');...
.concat()- add these new things to the end .swap(fromLemma, toLemma)- smart replace of root-words,using proper conjugation Transform .sort('method')- re-arrange the order of the matches (in place) .reverse()- reverse the order of the matches, but not the words ...