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js/css dynamically loads JS plug-ins

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Release： 2018-03-10 16:16:45

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This time I will bring you js/css dynamic loading JS plug-in, what are the precautions for making js/css dynamic loading JS plug-in , the following is a practical case, let's take a look.

JavaScript to create nodesAdd to body or head

Add js code:

var n = document.createElement("script");
n.setAttribute("type", "text/javascript");
n.setAttribute("src", i);document.body.appendChild(n); 
document.head.appendChild(n);

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Write a code to dynamically add node js:

/*
es6 中 函数设置默认参数可以使用 例:function 函数名(变量= 默认值) {...}
如果想要兼容可以使用 例:function 函数名(变量) {if(变量==undefined){变量= 默认值}....}
*/function cr_node(i, l = "body") { //创建节点并添加
    t = i.split(".").reverse()[0];//获取后缀
    var n = null;    if (t == "js") {//后缀判断
        n = document.createElement("script");
        n.setAttribute("type", "text/javascript");
        n.setAttribute("src", i);
    } else if (t == "css") {
        n = document.createElement("link");
        n.setAttribute("rel", "stylesheet");
        n.setAttribute("href", i);
    }    if (n != null) {        if (l == "body") {            document.body.appendChild(n);
        } else if (l == "head") {            document.head.appendChild(n);
        } else {
            l.appendChild(n);
        }
    }    return n;
}

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Usage example:

//添加bootstrap样式cr_node("http://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css","head")//默认添加jquery到<body>...</body>cr_node("http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js");//添加jquery到<head>...</head>cr_node("http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js","head");//添加jquery到<div id="id">...</div>cr_node("http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js",document.getElementById("id"))

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2. Add binding event function

Add a single node and bind the event

function cr_node(i, l = "body") {....}function addNode(o, c = undefined) { //单个添加
    var n = null;    if(typeof(o) == "object") {
        n = cr_node(o.src, (o.parent ? o.parent : "body"));        if(typeof(o.load) == "function") {
            n.onload = o.load; //绑定加载事件
        }        if(typeof(o.err) == "function") {
            n.onerror = o.err; //绑定错误事件
        }
    } else if(typeof(o) == "string") {
        n = cr_node(o); //直接添加节点
        if(typeof(c) == "function") {
            n.onerror = n.onload = c; //绑定加载事件
        }
    }
}

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Use Instructions:

//直接使用addNode("http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js",function(){...});//完整使用addNode({    "src": "http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js",    "load": function() {        console.log("加载成功");        console.log($("body").html());
    },    "err":function() {        console.log("加载失败");
    },    "parent": document.getElementById("id")//不写默认是body})

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3. Try to write a batch adding function

If you only want to add, you can use the following function:

function addNodes(o, index = 0) { //多个添加
    if (o.src.length > index && typeof(o.src) == "object" && o.src.length > 0) {        var n = cr_node(o.src[index], o.parent);        if (o.src.length - 1 == index && typeof(o.load) == "function") {
            n.onerror = n.onload = o.load;
        } else {
            n.onerror = n.onload = function() {
                addNodes(o, index + 1);
            }
        }
    }
}

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Usage example:

addNodes({ "src":["http://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.css","http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js","http://cdn.bootcss.com/jquery-cookie/1.4.1/jquery.cookie.min.js","http://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"],"parent":"head", 
"load":function(){ console.log(1111);   console.log($("body").html());
 }
})

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!