let age = 3;

console.log(`I'm ${age} years old!`);

你可以使用反撇号' '和ES6模板字符串

自定义灵活插补:

var sourceElm = document.querySelector('input') // interpolation callback const onInterpolate = s => `<mark>${s}</mark>` // listen to "input" event sourceElm.addEventListener('input', parseInput) // parse on window load parseInput() // input element parser function parseInput(){ var html = interpolate(sourceElm.value, undefined, onInterpolate) sourceElm.nextElementSibling.innerHTML = html; } // the actual interpolation function interpolate(str, interpolator = ["{{", "}}"], cb){ // split by "start" pattern return str.split(interpolator[0]).map((s1, i) => { // first item can be safely ignored if( i == 0 ) return s1; // for each splited part, split again by "end" pattern const s2 = s1.split(interpolator[1]); // is there's no "closing" match to this part, rebuild it if( s1 == s2[0]) return interpolator[0] + s2[0] // if this split's result as multiple items' array, it means the first item is between the patterns if( s2.length > 1 ){ s2[0] = s2[0] ? cb(s2[0]) // replace the array item with whatever : interpolator.join('') // nothing was between the interpolation pattern } return s2.join('') // merge splited array (part2) }).join('') // merge everything } input{ padding:5px; width: 100%; box-sizing: border-box; margin-bottom: 20px; } *{ font: 14px Arial; padding:5px; } <input value="Everything between {{}} is {{processed}}" /> <div></div>

下面是一个解决方案，它要求您提供一个具有值的对象。如果你不提供一个对象作为参数，它将默认使用全局变量。但是最好还是使用参数，这样更简洁。

String.prototype.interpolate = function(props) { return this.replace(/\{(\w+)\}/g, function(match, expr) { return (props || window)[expr]; }); }; // Test: // Using the parameter (advised approach) document.getElementById("resultA").innerText = "Eruption 1: {eruption1}".interpolate({ eruption1: 112 }); // Using the global scope var eruption2 = 116; document.getElementById("resultB").innerText = "Eruption 2: {eruption2}".interpolate(); <div id="resultA"></div><div id="resultB"></div>

试试kiwi吧，它是一个轻量级的JavaScript模块，用于字符串插值。

你可以这样做

Kiwi.compose("I'm % years old!", [age]);

or

Kiwi.compose("I'm %{age} years old!", {"age" : age});

虽然模板可能最适合你描述的情况，但如果你有或想要你的数据和/或参数是可迭代/数组形式，你可以使用String.raw。

String.raw({
  raw: ["I'm ", " years old!"]
}, 3);

将数据作为数组，可以使用展开操作符:

const args = [3, 'yesterday'];
String.raw({
  raw: ["I'm ", " years old as of ", ""]
}, ...args);

从ES6开始，你可以使用模板文字:

Const age = 3 console.log(' I'm ${age} years old! ')

附注:注意反引号的使用:' '。