javascript 或 jquery:在一个警报中显示多个变量

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时间:2020-08-26 20:59:58  来源:igfitidea点击:

javascript or jquery: show multiple variables in one alert

javascriptjqueryalert

提问by secr

Alert command assumes this structure:

警报命令采用以下结构:

alert (variable)

How to show multiple variables in a single alert?

如何在单个警报中显示多个变量?

回答by nnnnnn

Alert command assumes this structure: alert (variable)

警报命令采用以下结构: alert (variable)

No, alert()assumes this structure:

不,alert()假设这种结构:

    alert(some expression)

...where "some expression" is pretty much any JavaScript expression - if the expression is not a string it will be converted (though in some cases, e.g., for some objects the result might not be very meaningful).

...其中“某些表达式”几乎是任何 JavaScript 表达式 - 如果表达式不是字符串,它将被转换(尽管在某些情况下,例如,对于某些对象,结果可能不是很有意义)。

So:

所以:

alert(variable);
alert("string literal");
alert(variable1 + variable2 + variable3);
alert(variable1 + ", " + variable2);
alert(resultOfFunctionCall());
alert([1,2,3]);
alert(whatever() + "else" + you.can.think + "of");

Or even:

甚至:

alert();   // displays "undefined"

Note that if you are trying to debug your code you are better off using console.log()than alert(). If you are trying to produce a dynamic message to show the user just concatenate variables as needed, e.g.:

需要注意的是,如果你想调试你的代码,你有过使用更好的console.log()alert()。如果您尝试生成动态消息以显示用户只需根据需要连接变量,例如:

alert("Hello there " + name + ". Welcome.");

回答by Raptor

Do you mean this :

你的意思是:

alert (variable1 + ', ' + variable2);

No jQuery is required in this case.

在这种情况下不需要 jQuery。

回答by Harry

The below is how to do it:

下面是如何做到这一点:

var a = "Hello";
var b = "World!";

alert(a + b);

回答by Erik P

This works for me:

这对我有用:

window.alert = function (native) {
    return function (str) {
        var argsArray = Array.prototype.slice.call(arguments);
        var s = "";
        for (var i = 0; i < argsArray.length; i++) {
            msg = argsArray[i];
            if (typeof (msg) == 'object') msg = JSON.stringify(msg);
            s += msg;
            if (i < (argsArray.length - 1)) s += ',  ';
        }
        native(s);
    }
}(window.alert);

Try this:

尝试这个:

alert("This", "That", {"this":"that"});

警报(“这个”,“那个”,{“这个”:“那个”});