Question

我正在使用javascript。我想在javascript中继承Common对象和其他对象。有可能吗？我的意思是将这个js转换为原型模型。

function setEvent(evt, ele, callback) {
    var ele = getEle(ele);
    if (ele.length === undefined) {
        ele.addEventListener(evt, callback, false);
    } else if (ele.length > 0) {
        for (var i = 0; i < ele.length; i++) {
            ele[i].addEventListener(evt, callback, false);
        }
    }
    return false;
}

function getEle(ele) {
    var _idf = ele.charAt(0);
    if (_idf == "#") {
        var _ele = document.getElementById(ele.substr(1));
        return _ele;
    } else if (_idf == ".") {
        var _els = document.getElementsByClassName(ele.substr(1));
        return _els;
    }
    return ele;
}

function getInnerHtml(id) {
    return document.getElementById(id).innerHTML;
}

function getValue(elem) {

    return elem.value;

}

setEvent("click", ".input", function() {
    console.log(this.value);
    var _num = getInnerHtml("math");
    _num = _num + "" + getValue(this);
    document.getElementById("math").innerHTML = _num;

});

Answer 1

要了解您正在尝试构建的对象模型类型有点难，因为您没有描述这方面的任何要求或愿望。这里有一个像jQuery这样的工作的想法：

function core(selector) {
    if (!(this instanceof core)) {
        return new core(selector);
    }
    var items = document.querySelectorAll(selector);
    if (items) {
        this.items = Array.prototype.slice.call(items);
    } else {
        this.items = [];
    }
    this.length = this.items.length;
    return this;
}

core.prototype = {
    each: function(fn) {
        for (var i = 0; i < this.length; i++) {
            fn.call(this.items[i]);
        }
        return this;
    },
    firstProp: function(propName, defaultVal) {
        if (this.length > 0) {
            var val = this.items[0][propName];
            return  val !== undefined ? val : defaultVal;
        } else {
            return defaultVal;
        }

    },
    getHTML: function() {
        return this.firstProp("innerHTML", "");
    },
    setHTML: function(html) {
        return this.each(function() {
            this.innerHTML = html;
        });
    },
    on: function(event, fn) {
        return this.each(function() {
            this.addEventListener(event, fn);
        });
    },
    getValue: function() {
        return this.firstProp("value", "");
    }
};

然后，像你这样的用法示例：

core(".input").on("click", function(e) {
    console.log(this.value);
    var math = core("#math");
    math.setHTML(math.getHTML() + this.value);
});

工作演示：http://jsfiddle.net/jfriend00/t56L4p5f/

如何在javascript原型中继承Common对象与其他对象

1 个答案: