众所周知,JavaScript在所有现代浏览器实现中都是单线程的,但是它是在任何标准中指定的还是仅仅是传统的?假设JavaScript始终是单线程的,这是完全安全的吗?
我如何保持这个范围?
原版的
var Base = new function() {
var canvas;
var context;
this.init = function()
{
console.log("Canvas: " + $("canvas")[0])
this.canvas = $("canvas")[0];
console.log("Context: " + this.canvas.getContext('2d'))
this.context = this.canvas.getContext('2d');
$(window).resize(handleWindowResize);
handleWindowResize();
};
function handleWindowResize()
{
console.log("Resize Canvas [" + this.canvas + "] to {width: " +
$(window).width() + "," + $(window).width() + "}");
this.canvas.width = $(window).width();
this.canvas.height = $(window).height();
}
}
$(window).load(function() { new Base.init() });
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输出继电器:
Canvas: [object HTMLCanvasElement]
Context: [object CanvasRenderingContext2D]
Resize Canvas [undefined] to {width: 1680,1680} …Run Code Online (Sandbox Code Playgroud) 我找到了这个.它有什么作用?
function G(a, b) {
var c = function() { };
c.prototype = b.prototype;
a.T = b.prototype;
a.prototype = new c;
}
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在rails中,我有一种特殊的slice 方法来保留Hash我需要的键.在哈希中仅允许所需的密钥非常方便.
在Node.js中有这样的方法吗?