url获取指定参数值

• split分割放进对象

function getSearchParams(url) {
  var params = {}; 
  if (url.indexOf("?") != -1) {
    var strs = url.substr(1).split("&");
    for(var i = 0, ln = strs.lengt; i < ln; i ++) {
      var arr = strs[i].split("=");
      params[arr[0]]=decodeURLcomponent(arr[1]); 
    } 
  } 
  return params; 
}

var data = getSearchParams(location.search);
console.log(data['q']);

• 正则表达式匹配

function getQueryString(name) {
  var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
  var r = window.location.search.substr(1).match(reg);
  if (r != null) return decodeURLcomponent(r[2]); 
  return null;
}
 
var query = getQueryString("q");
console.log(query);