全选全不选，返回字符串长度，汉字计数为2，获取url中的参数 ，函数防抖，函数节流

/*   全选/全不选  */

function selectAll(objSelect) {
            if (objSelect.checked == true) {
                $("input[name=‘chkId‘]").attr("checked", true);
                $("input[name=‘chkAll‘]").attr("checked", true);
            }
            else if (objSelect.checked == false) {
                $("input[name=‘chkId‘]").attr("checked", false);
                $("input[name=‘chkAll‘]").attr("checked", false);
            }
        }

/* js 动态移除 head 里的 js 引用  */

    this.ClearHeadJs = function (src) {
        var js = document.getElementsByTagName(‘head‘)[0].children;
        var obj = null;
        for (var i = 0; i < js.length; i++) {
            if (js[i].tagName.toLowerCase() == "script" && js[i].attributes[‘src‘].value.indexOf(src) > 0) {
                obj = js[i];
            }
        }
        document.getElementsByTagName(‘head‘)[0].removeChild(obj);
    };

/*返回字符串长度，汉字计数为2*/
function strLength(str) {
    var a = 0;
    for (var i = 0; i < str.length; i++) {
        if (str.charCodeAt(i) > 255)
            a += 2;//按照预期计数增加2
        else
            a++;
    }
    return a;
}


获取url中的参数 


function GetQueryStringRegExp(name,url) {
    var reg = new RegExp("(^|\\?|&)" + name + "=([^&]*)(\\s|&|$)", "i");
    if (reg.test(url)) return decodeURIComponent(RegExp.$2.replace(/\+/g, " ")); return "";
}


/*函数防抖*/

function debounce(func, delay) {
  let timer

  return function (...args) {
    if (timer) {
      clearTimeout(timer)
    }
    timer = setTimeout(() => {
      func.apply(this, args)
    }, delay)
  }
}

/*函数节流*/

var throttle = function(delay, action){
  var last = 0
  return function(){
    var curr = +new Date()
    if (curr - last > delay){
      action.apply(this, arguments)
      last = curr 
    }
  }
}