Question

我有一个看起来像这样的字符串：

var minLength = 3;
var mystring = "This field must be {{minLength}} characters"

我很想知道检测{{ ... }}是否存在的好方法，并用minLength变量替换内容。你可能会想到有很多不同的变量，比如minLength，maxLength等。我试过regex但似乎无法让它工作。

Answer 1

var values = {
    minLength: 3
};

var text = "This field must be {{minLength}} characters";
var mystring = text.replace(/\{\{([^}]+)\}\}/, function(i, match) {
    return values[match];
});

demo

通过这种方式，您可以添加多个要替换的值，只需添加values并将g添加到正则表达式。

var values = {
    minLength: 3,
    maxLength: 10
};

var text = "This field must be min {{minLength}} characters and max {{maxLength}}";
var mystring = text.replace(/\{\{([^}]+)\}\}/g, function(i, match) {
    return values[match];
});
console.log(mystring); // This field must be min 3 characters and max 10

demo

Answer 2

var newString =  mystring.replace(/{{minLength}}/,minLength);

Answer 3

您可以使用此方法：

var str = "This field must be {{minLength}} characters";
var result = str.replace(/{{minLength}}/,"3");
alert(result);

演示：fiddle

如果存在，Javascript替换字符串中的内容

3 个答案: