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()
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(...
(2).字符串中某一个指定的字符首次出现的位置:string1.indexOf('a') = 3 (3).把两个字符串链接起来:string1.concat(string2) = '123abcdefgabdfhello' 或 string1+string2 = '123abcdefgadfhello' (4).字符串中的替换:string1.replace(/ab/,'hh') = '123hhcdefghhdfhello' (5).字符串的某个部...
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...
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.
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...
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]) { ...
function flatten(arr) { let result = []; for (let i = 0; i < arr.length; i++) { if (Array.isArray(arr[i])) { result = result.concat(flatten(arr[i])); } else { result = result.concat(arr[i]); } } return result; ...
// 普通方式constarr=[1,2,3]constbiggerArr=[4,5,6].concat(arr)constsmallObj={x:1}constotherObj=object.assign(smallObj,{y:2})// 简写方式constarr=[1,2,3]constbiggerArr=[...arr,4,5,6]constsmallObj={x:1}constotherObj={...smallObj,y:2} ...