什么是window.console&& CONSOLE.LOG？ [英] What is window.console && console.log?

问题描述

 if (open_date) {
        open_date = get_date_from_string(open_date);
        window.console && console.log(open_date);
        window.console && console.log(cancel_until);

什么是 window.console&& console.log ？它必须在代码中吗？通过这个脚本不适用于IE（所有版本） - > IE运行javascript仅在按F12后

What is window.console && console.log ? Does it have to be in the code? Through this script does not work on IE (all version) --> IE runs javascript only after pressing F12

推荐答案

只有当leftside-expression为<$ c时，才会评估rightside-expression $ C> truthy 。这就是逻辑AND 运算符的工作原理。

The rightside-expression will only get evaluated if the leftside-expression is truthy. Thats how the logical AND operator works.

它基本上是

if( window.console ) {
    console.log( open_date );
}

正如你可能猜到的那样，这是一种常见的情况，因为 console 对象可能无法在每个浏览器（尤其是手机）上使用。

As you might guess correctly, it's a common pattern for this case, because the console object might not be available on every browser (especially mobiles).

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