Question

以下是我试图在网页上找到单词的代码。但是，我无法获得所需的功能。当单击浏览器中的扩展图标时，警报消息会出现＆＃34; Not Found＆＃34;，当警报窗口关闭时，文本框和按钮出现，当单击按钮时没有任何反应。

所需功能：用户输入文本并单击按钮，如果未找到该单词，则应显示警告消息。

需要建议才能让它发挥作用。感谢

的index.html

var n = 0;
function findInPage(str) {
console.log("We are here");

var txt, i, found;
if (str == "") {
    return false;
}
// Find next occurance of the given string on the page, wrap around   to   the
// start of the page if necessary.
if (window.find) {
    // Look for match starting at the current point. If not found, rewind
    // back to the first match.
    if (!window.find(str)) {
        while (window.find(str, false, true)) {
            n++;
        }
    } else {
        n++;
    }
    // If not found in either direction, give message.
    if (n == 0) {
        alert("Not found.");
    }
} else if (window.document.body.createTextRange) {
    txt = window.document.body.createTextRange();
    // Find the nth match from the top of the page.
    found = true;
    i = 0;
    while (found === true && i <= n) {
        found = txt.findText(str);
        if (found) {
            txt.moveStart("character", 1);
            txt.moveEnd("textedit");
        }
        i += 1;
    }
    // If found, mark it and scroll it into view.
    if (found) {
        txt.moveStart("character", -1);
        txt.findText(str);
        txt.select();
        txt.scrollIntoView();
        n++;
    } else {
        // Otherwise, start over at the top of the page and find first match.
        if (n > 0) {
            n = 0;
            findInPage(str);
        }
        // Not found anywhere, give message. else
        alert("Not found.");
    }
}
return false;
}

window.onload=function(){
console.log("On load function");
var bt = document.getElementsByClassName('btn');
bt.addEventListerner('click',findInPage());
console.log("After function call");
};

content.js

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Chrome扩展程序JavaScript功能

0 个答案: