1.获取地址栏参数
function getUrlPara(paraName){
var sUrl = location.href;
var sReg = "(?:\\?|&){1}"+paraName+"=([^&]*)";
var re=new RegExp(sReg,"gi");
re.exec(sUrl);
return RegExp.$1;
}
//应用实例：test_para.html?a=11&b=22&c=33
console.log(getUrlPara("a")); 、
console.log(getUrlPara("b"));
2.发送验证码计时器
<input id="send" type="button" value="发送验证码">
var times = 60, // 临时设为60秒
document.getElementById('send').onclick = function () {
timer = setInterval(function () {
times--;
if (times <= 0) {
send.value = '发送验证码';
clearInterval(timer);
send.disabled = false;
times = 60; }
else {
send.value = times + '秒后重试';
send.disabled = true;
}
}, 1000);
}
3.数值每三位加逗号(钱转换)
function toThousands(number) {
var arr = String(number).split('.');
var num = arr[0], result = '';
while (num.length > 3) {
result = ',' + num.slice(-3) + result;
num = num.slice(0, num.length -3);
}
if (num.length > 0) result = num + result;
return arr[1] ? result + '.' + arr[1] : result
}
}
4.快速求数组的平均数（reduce，箭头函数）
const average = arr => arr.reduce((acc, val) => acc + val, 0) / arr.length;
// average([1,2,3]) -> 2
5.数组去重（es6）
const unique = arr => [...new Set(arr)];
// unique([1,2,2,3,4,4,5]) -> [1,2,3,4,5]
6.数组对象方法排序（按照对象的某个属性）
function sortByKey(array,key){
return array.sort(function(a,b){
var x=a[key];
var y=b[key];
return ((x<y)?-1:((x>y)?1:0));
})
}
7.输入框限定字符的个数（一个汉字算两个字符）
function getByteVal(val, max) {
var returnValue = '';
var byteValLen = 0;
for (var i = 0; i < val.length; i++) {
if (val[i].match(/[^\x00-\xff]/ig) != null)
byteValLen += 2;
else
byteValLen += 1;
if (byteValLen > max)
break;
returnValue += val[i];
}
return returnValue;
}
$('#txt').bind('keyup',function(){
var val=this.value;
if(val.replace(/[^\x00-\xff]/g,"**").length>14){
this.value=getByteVal(val,14)
}
})
8.将时间戳转成yyyy-MM-dd HH:mm:ss的格式
/**
* timestamp：1469085472490
*/
var timestampToFormatDate = function(timestamp){
var date = new Date(); date.setTime(timestamp);
var year = date.getFullYear();
var month = date.getMonth() + 1;
var day = date.getDate();
var hour = date.getHours();
var minute = date.getMinutes();
var second = date.getSeconds();
return year + '-' + supplementZero(month,2) + '-' + supplementZero(day,2) + ' ' +
supplementZero(hour,2) + ':' + supplementZero(minute,2) + ':' + supplementZero(second,2);
}
9.返回顶部
function backTop(btnId) {
var btn = document.getElementById(btnId);
var d = document.documentElement;
var b = document.body;
window.onscroll = set;
btn.style.display = "none";
btn.onclick = function() {
btn.style.display = "none";
window.onscroll = null;
this.timer = setInterval(function() {
d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
if ((d.scrollTop + b.scrollTop) == 0) clearInterval(btn.timer, window.onscroll = set);
},
10);
};
function set() {
btn.style.display = (d.scrollTop + b.scrollTop > 100) ? 'block': "none"
}
};
backTop('goTop');
9.Jquery中$.post和$.ajax的用法
$.ajax({
type:'get',
url:'https://www.www.phpernote.com/rss',
beforeSend:function(XMLHttpRequest){
//ShowLoading();
},
success:function(data,textStatus){
$('.ajax.ajaxResult').html('');
$('item',data).each(function(i,domEle){
$('.ajax.ajaxResult').append('<li>'+$(domEle).children('title').text()+'</li>');
});
},
complete:function(XMLHttpRequest,textStatus){
//HideLoading();
},
error:function(){
//请求出错处理
}
});
10.拖拽事件的封装
function drag(index){
index.onmousedown = function(event){
var ev = event ||window.event;
ev.preventDefault();
disX = ev.clientX-this.offsetLeft;
disY = ev.clientY-this.offsetTop;
//给index绑定moousemove事件
document.onmousemove = function(event){
var ev = event ||window.event;
ev.preventDefault();
var x = ev.clientX;
var y = ev.clientY;
index.style.left = x-disX+'px';
index.style.top = y-disY+'px';
}
}
document.onmouseup =function(){
document.onmousemove = null;
}
}
11.数组的搜索功能
var fruits = ['apple','banana','grapes','mango','orange'];、
function filterItems(query) {
return fruits.filter(function(el) {
return el.toLowerCase().indexOf(query.toLowerCase()) > -1;
})
}
console.log(filterItems('ap'));
// ['apple', 'grapes']
11.求数组的最大值
//最大值
Array.prototype.max = function() {
var max = this[0];
var len = this.length;
for (var i = 1; i < len; i++){
if (this[i] > max) {
max = this[i];
}
}
return max;
}
12.删除数组某一个元素
Array.prototype.remove = function(val){
var index = this.indexOf(val);
if(index !=0){
this.splice(index,1)
}
}
[1,3,4].remove(3)
