详解javascript常用工具类的封装(7)

/*获取网址参数*/
getURL(name){
  var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
  var r = window.location.search.substr(1).match(reg);
  if(r!=null) return r[2]; return null;
}

/*获取全部url参数,并转换成json对象*/
getUrlAllParams (url) {
  var url = url ? url : window.location.href;
  var _pa = url.substring(url.indexOf('?') + 1),
    _arrS = _pa.split('&'),
    _rs = {};
  for (var i = 0, _len = _arrS.length; i < _len; i++) {
    var pos = _arrS[i].indexOf('=');
    if (pos == -1) {
      continue;
    }
    var name = _arrS[i].substring(0, pos),
      value = window.decodeURIComponent(_arrS[i].substring(pos + 1));
    _rs[name] = value;
  }
  return _rs;
}

/*删除url指定参数，返回url*/
delParamsUrl(url, name){
  var baseUrl = url.split('?')[0] + '?';
  var query = url.split('?')[1];
  if (query.indexOf(name)>-1) {
    var obj = {}
    var arr = query.split("&");
    for (var i = 0; i < arr.length; i++) {
      arr[i] = arr[i].split("=");
      obj[arr[i][0]] = arr[i][1];
    };
    delete obj[name];
    var url = baseUrl + JSON.stringify(obj).replace(/[\"\{\}]/g,"").replace(/\:/g,"=").replace(/\,/g,"&");
    return url
  }else{
    return url;
  }
}

/*获取十六进制随机颜色*/
getRandomColor () {
  return '#' + (function(h) {
    return new Array(7 - h.length).join("0") + h;
  })((Math.random() * 0x1000000 << 0).toString(16));
}

/*图片加载*/
imgLoadAll(arr,callback){
  var arrImg = []; 
  for (var i = 0; i < arr.length; i++) {
    var img = new Image();
    img.src = arr[i];
    img.onload = function(){
      arrImg.push(this);
      if (arrImg.length == arr.length) {
        callback && callback();
      }
    }
  }
}

/*音频加载*/
loadAudio(src, callback) {
  var audio = new Audio(src);
  audio.onloadedmetadata = callback;
  audio.src = src;
}

/*DOM转字符串*/
domToStirng(htmlDOM){
  var div= document.createElement("div");
  div.appendChild(htmlDOM);
  return div.innerHTML
}

/*字符串转DOM*/
stringToDom(htmlString){
  var div= document.createElement("div");
  div.innerHTML=htmlString;
  return div.children[0];
}


/**
 * 光标所在位置插入字符，并设置光标位置
 * 
 * @param {dom} 输入框
 * @param {val} 插入的值
 * @param {posLen} 光标位置处在 插入的值的哪个位置
 */
setCursorPosition (dom,val,posLen) {
  var cursorPosition = 0;
  if(dom.selectionStart){
    cursorPosition = dom.selectionStart;
  }
  this.insertAtCursor(dom,val);
  dom.focus();
  console.log(posLen)
  dom.setSelectionRange(dom.value.length,cursorPosition + (posLen || val.length));
}

/*光标所在位置插入字符*/
insertAtCursor(dom, val) {
  if (document.selection){
    dom.focus();
    sel = document.selection.createRange();
    sel.text = val;
    sel.select();
  }else if (dom.selectionStart || dom.selectionStart == '0'){
    let startPos = dom.selectionStart;
    let endPos = dom.selectionEnd;
    let restoreTop = dom.scrollTop;
    dom.value = dom.value.substring(0, startPos) + val + dom.value.substring(endPos, dom.value.length);
    if (restoreTop > 0){
      dom.scrollTop = restoreTop;
    }
    dom.focus();
    dom.selectionStart = startPos + val.length;
    dom.selectionEnd = startPos + val.length;
  } else {
    dom.value += val;
    dom.focus();
  }
}