我想做一个可以做这样的事情的函数:
.HTML:
<h1 class="demo">I am {{ name }}</h1>
<span class="demo">{{ name }} learn JavaScript</span>
.JS:
data(".demo", {
name: "Arc"
};
输出:
I am Arc
Arc learn JavaScript
可以制作可以做到这一点的 data(( 函数吗?我不想使用任何外部库来仅使用此函数!
使用正则表达式将 HTML 中的{{ .. }}
s 替换为传递对象中的相应值(如果有(:
const data = (selector, obj) => {
document.querySelectorAll(selector).forEach((elm) => {
elm.textContent = elm.textContent.replace(
/{{ *(w+) *}}/g,
// If key is in the obj, replace with the value
// otherwise, replace with the match (make no changes):
(match, key) => key in obj ? obj[key] : match
);
});
};
data(".demo", {
name: "Arc"
});
<h1 class="demo">I am {{ name }}</h1>
<span class="demo">{{ name }} learn JavaScript</span>
如果还需要考虑嵌套元素,请选择父级的所有文本节点,并执行相同的操作:
const getTextNodes = (parent) => {
// https://stackoverflow.com/questions/2579666/getelementsbytagname-equivalent-for-textnodes
var walker = document.createTreeWalker(
parent,
NodeFilter.SHOW_TEXT,
null,
false
);
var node;
var textNodes = [];
while(node = walker.nextNode()) {
textNodes.push(node);
}
return textNodes;
}
const data = (selector, obj) => {
document.querySelectorAll(selector).forEach((elm) => {
getTextNodes(elm).forEach((node) => {
node.textContent = node.textContent.replace(
/{{ *(w+) *}}/g,
// If key is in the obj, replace with the value
// otherwise, replace with the match (make no changes):
(match, key) => key in obj ? obj[key] : match
);
});
});
};
data(".demo", {
name: "Arc"
});
span > span {
background-color: yellow;
}
<h1 class="demo">I am {{ name }}</h1>
<span class="demo">{{ name }} learn JavaScript <span> nested {{ name }} </span></span>