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javascript - 我想使用链接中的参数向网页添加倒计时

问题描述

我们正在使用 niftyimages 在我们的电子邮件中添加倒计时，并希望在我们的网页上使用倒计时。当他们点击从电子邮件到登录页面的链接时，我们希望将其个性化。

所以如果我们有一个链接： www.webpage.com?dt= 2021-06-01

我试过这段代码：

function getAllUrlParams(url) {

  // get query string from url (optional) or window
  var queryString = url ? url.split('?')[1] : window.location.search.slice(1);

  // we'll store the parameters here
  var obj = {};

  // if query string exists
  if (queryString) {

  // stuff after # is not part of query string, so get rid of it
  queryString = queryString.split('#')[0];

  // split our query string into its component parts
  var arr = queryString.split('&');

  for (var i = 0; i < arr.length; i++) {
    // separate the keys and the values
    var a = arr[i].split('=');

    // set parameter name and value (use 'true' if empty)
    var paramName = a[0];
    var paramValue = typeof (a[1]) === 'undefined' ? true : a[1];

    // (optional) keep case consistent
    paramName = paramName.toLowerCase();
    if (typeof paramValue === 'string') paramValue = paramValue.toLowerCase();

    // if the paramName ends with square brackets, e.g. colors[] or colors[2]
    if (paramName.match(/\[(\d+)?\]$/)) {

      // create key if it doesn't exist
      var key = paramName.replace(/\[(\d+)?\]/, '');
      if (!obj[key]) obj[key] = [];

      // if it's an indexed array e.g. colors[2]
      if (paramName.match(/\[\d+\]$/)) {
        // get the index value and add the entry at the appropriate position
        var index = /\[(\d+)\]/.exec(paramName)[1];
        obj[key][index] = paramValue;
      } else {
        // otherwise add the value to the end of the array
        obj[key].push(paramValue);
      }
    } else {
      // we're dealing with a string
      if (!obj[paramName]) {
        // if it doesn't exist, create property
        obj[paramName] = paramValue;
      } else if (obj[paramName] && typeof obj[paramName] === 'string'){
        // if property does exist and it's a string, convert it to an array
        obj[paramName] = [obj[paramName]];
        obj[paramName].push(paramValue);
      } else {
        // otherwise add the property
        obj[paramName].push(paramValue);
      }
    }
  }
}

return obj;
} 

console.log(getAllUrlParams("https://img1.niftyimages.com/q24/9jso/fjad?dt=2021-07-21&format=yyyy-MM-dd"));

来自 niftyimages 的图像是<img src="https://img1.niftyimages.com/q24/9jso/fjad?dt=2021-07-21&format=yyyy-MM-dd" />

我已经隔离了 dt=2021-06-01，如何替换图片 url 中的“dt=2021-07-21”部分？

标签： javascriptcountdown

解决方案

如何使用replace和template ${literals}。

function getAllUrlParams(url) {

  // get query string from url (optional) or window
  var queryString = url ? url.split('?')[1] : window.location.search.slice(1);

  // we'll store the parameters here
  var obj = {};

  // if query string exists
  if (queryString) {

  // stuff after # is not part of query string, so get rid of it
  queryString = queryString.split('#')[0];

  // split our query string into its component parts
  var arr = queryString.split('&');

  for (var i = 0; i < arr.length; i++) {
    // separate the keys and the values
    var a = arr[i].split('=');

    // set parameter name and value (use 'true' if empty)
    var paramName = a[0];
    var paramValue = typeof (a[1]) === 'undefined' ? true : a[1];

    // (optional) keep case consistent
    paramName = paramName.toLowerCase();
    if (typeof paramValue === 'string') paramValue = paramValue.toLowerCase();

    // if the paramName ends with square brackets, e.g. colors[] or colors[2]
    if (paramName.match(/\[(\d+)?\]$/)) {

      // create key if it doesn't exist
      var key = paramName.replace(/\[(\d+)?\]/, '');
      if (!obj[key]) obj[key] = [];

      // if it's an indexed array e.g. colors[2]
      if (paramName.match(/\[\d+\]$/)) {
        // get the index value and add the entry at the appropriate position
        var index = /\[(\d+)\]/.exec(paramName)[1];
        obj[key][index] = paramValue;
      } else {
        // otherwise add the value to the end of the array
        obj[key].push(paramValue);
      }
    } else {
      // we're dealing with a string
      if (!obj[paramName]) {
        // if it doesn't exist, create property
        obj[paramName] = paramValue;
      } else if (obj[paramName] && typeof obj[paramName] === 'string'){
        // if property does exist and it's a string, convert it to an array
        obj[paramName] = [obj[paramName]];
        obj[paramName].push(paramValue);
      } else {
        // otherwise add the property
        obj[paramName].push(paramValue);
      }
    }
  }
}

return obj;
} 

function replace_url_param(url, param, replacement)
{
  let params = getAllUrlParams(url);
  return url.replace(`${param}=${params[param]}`, `${param}=${replacement}`)
}

let image = document.getElementById('image');
image.addEventListener('mouseover', function() {
  image.src = replace_url_param("https://img1.niftyimages.com/q24/9jso/fjad?dt=2021-07-21&format=yyyy-MM-dd", 'dt', '2021-06-05');
});

console.log(replace_url_param("https://img1.niftyimages.com/q24/9jso/fjad?dt=2021-07-21&format=yyyy-MM-dd", 'dt', '2021-06-05'));
<img src="https://img1.niftyimages.com/q24/9jso/fjad?dt=2021-07-21&format=yyyy-MM-dd" id="image">

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