摘要：放大鏡頁面加載完畢后執(zhí)行親沒有數(shù)據(jù)哦動態(tài)添加標簽加載地址后傳入輸出一個函數(shù)在上面則定義好這個函數(shù)接受一個就是資源類型循環(huán)輸出可先查看數(shù)據(jù)點擊一次，從多少開始獲取獲取指定區(qū)間范圍隨機數(shù)，包括和如獲

        //頁面加載完畢后執(zhí)行
        window.onload = function () {

            var oDemo = document.getElementById("demo");
            var oMark = document.getElementById("mark");
            var FloatBox = document.getElementById("float-box");
            var SmallBox = document.getElementById("small-box");
            var bigBox = document.getElementById("big-box");
            var bigImg = bigBox.getElementsByTagName("img")[0];

            oMark.onmouseover = function (){
                FloatBox.style.display = "block";
                bigBox.style.display = "block";
            }

            oMark.onmouseout = function (){
                FloatBox.style.display = "none";
                bigBox.style.display = "none";
            }

            oMark.onmousemove = function (ev){

                var ev = ev || window.event;
                var left = ev.clientX - oDemo.offsetLeft - SmallBox.offsetLeft - FloatBox.offsetWidth / 2;
                var top = ev.clientY - oDemo.offsetTop - SmallBox.offsetTop - FloatBox.offsetHeight / 2;

                if(left < 10){

                    left = 0;

                }else if(left >= oMark.offsetWidth - FloatBox.offsetWidth - 10){

                    left = oMark.offsetWidth - FloatBox.offsetWidth;

                }

                if(top < 10){

                    top = 0;

                }else if(top >= oMark.offsetHeight - FloatBox.offsetHeight - 10){

                    top = oMark.offsetHeight - FloatBox.offsetHeight;

                }

                FloatBox.style.left = left + "px";
                FloatBox.style.top = top + "px";

                var scaleX = left / (oMark.offsetWidth - FloatBox.offsetWidth);
                var scaleY = top / (oMark.offsetHeight - FloatBox.offsetHeight);

                bigImg.style.left = -scaleX * (bigImg.offsetWidth - bigBox.offsetWidth) + "px";
                bigImg.style.top = -scaleY * (bigImg.offsetHeight - bigBox.offsetHeight) + "px";

            }

        }
        

        function fn1(data){
            var html = "";
            var oUl = document.getElementsByTagName("ul")[0];

            console.log(data);

            if(data.total != -1){
                for(var i=0; i "+ data.books[i].author_intro +"
"+ data.books[i].summary +"
 
" + data.books[i].publisher + "
";
    
                }
    
                oUl.innerHTML = html;
            
            }else{
                document.body.innerHTML+="
親~~ 沒有數(shù)據(jù)哦~~~
";
            }
            
        }
    
    window.onload = function (){
        
        var oBtn = document.getElementById("btn");
        var iNow = 0;
        oBtn.onclick = function (){
            //動態(tài)添加 script 標簽   加載URL地址 后傳入 callback=fn1 輸出一個函數(shù), 在上面則定義好這個函數(shù), 接受一個data 就是資源  json類型,循環(huán)輸出, 可先console.log(dara) 查看數(shù)據(jù)
            var oScript = document.createElement("script");
            
            oScript.src="https://api.douban.com/v2/book/search?q=%E6%A0%A1%E5%9B%AD&count=10&start="+ iNow +"&callback=fn1";
            document.head.appendChild(oScript);
            
            // 點擊一次+10，從多少開始獲取
            iNow += 10;
        
        }
            
    }

function randomFrom(lowerValue,upperValue)
{
    return Math.floor(Math.random() * (upperValue - lowerValue + 1) + lowerValue);
}
//如獲取1-100之間的隨機數(shù)
console.log(randomFrom(1,100));

1、快速排序
    
    /** 
     *   得到中間那位那位數(shù),然后循環(huán)判斷, arr[i] < 中間數(shù) 則push leftArr, 否則push rightArr, 最后返回 left數(shù)組 "拼接" 中間數(shù) + right數(shù)組 
     */
    function sort(arr){
    
        if(arr.length <= 1){
            return arr;
        }
    
        var numIndex = Math.floor(arr.length/2);
        var numVal = arr.splice(numIndex,1);
        var leftArr = [];
        var rightArr = [];
    
        for(var i=0; i
5、數(shù)組去重
1、indexOf 去重

/**
 *   當(dāng)arr的第一次出現(xiàn)的位置 == i  則是第一次出現(xiàn)就push到tempArr
 */
function unique(arr){

    if (arr.length <= 1){
        return arr;
    }

    var tempArr = [];

    for(var i=0; i
6、深度拷貝
/** 
 *     深度拷貝
 *     使用for in 在循環(huán)賦值，避免對象引用
 */
function copy(obj){

    if(typeof obj != "object"){
        return obj;
    }

    var newObj = {};

    for(var attr in obj){

        newObj[attr] = copy(obj[attr]);

    }

    return newObj;

}