参数转编码;递归;转化参数格式

过滤参数，过滤空字符串；

export function paramFilter(params = {}) {
    let result = {};
    for(let k in params) {
        if (params[k] !== undefined && params[k] !== null) {
            result[k] = window.encodeURIComponent(params[k]);
        }
    }
    return result;
}

encodeURIComponent() 函数将转义用于分隔 URI 各个部分的标点符号
举个栗子：

document.write(encodeURIComponent("http://www.w3school.com.cn"))  
document.write(encodeURIComponent("http://www.w3school.com.cn/p 1/"))  
document.write(encodeURIComponent(",/?:@&=+$#"))  
 
//对比  
// http%3A%2F%2Fwww.w3school.com.cn  
// http%3A%2F%2Fwww.w3school.com.cn%2Fp%201%2F  
// %2C%2F%3F%3A%40%26%3D%2B%24%23  

断target是否有特定的className:

export function isSpecialSon(target, className){
    let flag = false; // 默认为否
    let selfTarget = null;
    // 闭包 用以公用变量
    function fn(_target){
        // 判断target是否有特定的className
    
        // 递归的出口
        if(flag || !_target){
            return;
        }
        if(!_target.classList){
            return;
        }
    
        if(_target.classList.contains(className)){
            flag = true;
            selfTarget = _target;
        }else {
            // 递归的入口
            fn(_target.parentNode);
        }
    }
  
    fn(target);
    return {flag, selfTarget};
}

将对象转成地址栏参数

export function getRequestQuery(query) {
    const res = [];
    Object.entries(query).forEach(o => res.push(`${o[0]}=${o[1]}`));
    return res.join('&');
}

let  obj={
 key:13,
 value:"hhhh",
 info:"users"
};

console.log(getRequestQuery(obj));

//  key=13&value=hhhh&info=users