Get the query parameter in the address URL specify the parameter method

Get address url Medium query Parameterspecify the parameter method

Scheme 1 ：（ Best compatibility , But it's a little long ）

	function getParam(name) {
    
      // First get # Later parameters 
      var getValue = function(name, str) {
    
        // To obtain parameters name Value 
        var reg = new RegExp("(^|!|&|\\?)" + name + "=([^&]*)(&|$)");
        // Get more ? Later parameters 
        var r = str.match(reg);
        if (r != null) {
    
          try {
    
            return decodeURIComponent(r[2]);
          } catch (e) {
    
            console.log(e + "r[2]:" + r[2]);
            return null;
          }
        }
        return null;
      };
      var str = document.location.hash.substr(2);
      var value = getValue(name, str);
      if (value == null) {
    
        str = document.location.search.substr(1);
        value = getValue(name, str);
      }
      return value;
    }

Option two ： Compatibility （ Support es6 Of map Can ）

function getParams(key){
    
    var ops = {
    };
	window.location.href.split('?')[1].split('&').map(i => ops[(i.split('=')[0])] = i.split('=')[1]);
    return ops[key]
}

Option three ： Compatibility （ Support es6 Can ）

• ts Unavailable , Need to change return That line
• ?. Expressed as true Just continue to follow the chain

function getParams(key){
    
    var str = window.location.href.split('?')[1].split('&').filter(i => i.startsWith(key+'='));
    return str?.[0]?.split('=')[1]
}

Basically, mainstream browsers have no problem , Generally, I use the first kind of omnipotent , But it's a little long