小编And*_*rew的帖子

我刚刚遇到了这个精美的javascript电子表格代码，以前从未见过：http : //jsfiddle.net/ondras/hYfN3/

它使用名为getter对象的单元格引用作为DATA对象的属性，并使用“ with”对单元格值进行范围评估。

//elm.id is the cell reference, DATA is an object whose properties are these getter wrappers
Object.defineProperty(DATA, elm.id, {get:getter});

魔术发生在吸气剂中：

    //My comments but jsfiddle code from Ond?ej Žára's fiddle 
    //Cell value getter function..  
    var getter = function() {
        var value = localStorage[elm.id] || ""; //Direct cell contents
        if (value.charAt(0) == "=") { //Got a formula, work it out
            //strip the '=' and evaluate recursively with this getter func
            with (DATA) return eval(value.substring(1));
        } else { …