JS随机生成密码（必须包含大小写字母，数字和特殊符号）

    function randomPassword(length) {
        length = Number(length)
        if (length < 6) {
            length = 6
        } else if (length > 16) {
            length = 16
        }
        let passwordArray = ['ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz', '1234567890', '!@#$%&*()'];
        var password = [];
        let n = 0;
        for (let i = 0; i < length; i++) {
            if ( password.length < (length - 4) ) {
                let arrayRandom = Math.floor(Math.random() * 4);
                let passwordItem = passwordArray[arrayRandom];
                let item = passwordItem[Math.floor(Math.random() * passwordItem.length)];
                password.push(item);
            } else {
                let newItem = passwordArray[n];
                let lastItem = newItem[Math.floor(Math.random() * newItem.length)];
                let spliceIndex = Math.floor(Math.random() * password.length);
                password.splice(spliceIndex, 0, lastItem);
                n++
            }
        }
        return password.join("");
    }