Javascript 分割字符串在 .但不是 。引号后

Question

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Answer 1

basically i am trying to write a switch statement to turn jquery into js so if you wrote $('p').hide() that would hide all the p tags but if you wrote $('.p').hide() that would hide all of the .p classes

您似乎不想使用 jQuery，而您正在尝试编写一个解析器，将 jQuery 代码转换为相应的 DOM API。这可能会导致灾难。创建一个以某种方式像 jQuery 一样工作的简单构造函数更有意义。像这样的东西:

function $(selector) {
    if (!(this instanceof $)) {
        return new $(selector);
    }

    this.length = 0;

    if (typeof selector === 'undefined') {
        return this;
    }

    var q = document.querySelectorAll(selector);
    for (var i = 0, l = q.length; i < l; i++) {
        this[i] = q[i];
    }
    this.length = q.length;
    return this;
}

$.prototype.each = function(cb) {
    for (var i = 0, l = this.length; i < l; i++) {
        cb.apply(this[i], [i, this[i]]);
    }
    return this;
}

$.prototype.hide = function() {
    return this.each(function(i, el) {
        el.style.display = 'none';
    });
}

$ 函数接受 document.querySelectorAll 的所有选择器接受。