生成26 个字母并将随机获取n个输出String 及数组间比较差异

红太狼 2021-09-20 23:36 269阅读 0赞

## 产生26个字母 ##

let createChar = () => { 
    				var lowChar = []
    				for (var i = 97; i < 123; i++) { 
    					lowChar.push(String.fromCharCode(i))
    				}
    				return lowChar;
    			}

## 数组洗牌 ##

let shuffle = (a) => { 
    				for (let i = a.length; i; i--) { 
    					let j = Math.floor(Math.random() * i);
    					[a[i - 1], a[j]] = [a[j], a[i - 1]];
    				}
    				return a;
    			}

## 获取数组指定长度并转换为String ##

let createID = (length) => { 
    				let cha = shuffle(createChar());
    				let ss = "";
    				// c 为下标
    				for (let c in cha) { 
    					ss = ss + cha[c]
    					// console.log(ss)
    					if (c == length - 1) { 
    						return ss
    					}
    				}
    			}
    
    			alert(createID(5))

## 数组之间元素差异比较 ##

*  获取相同元素

*  获取不同元素

/**
    			 * 获取数组中不同元素
    			 */
    			let getDef = (a, b) => { 
    				let def = [];
    				//s 为数组元素
    				for (let s of a) { 
    					if (b.indexOf(s) == -1) { 
    						def.push(s)
    					}
    				}
    				for (let s of b) { 
    					if (a.indexOf(s) == -1) { 
    						def.push(s)
    					}
    				}
    				if (def.length == 0) { 
    					console.log("两个数组居然一模一样不信你看" + "第一个数组：" + a + "第二个数组：" + b)
    				}
    				return def;
    			}
    			console.log("getDef函数获取不相同元素--->" + getDef(a, b))