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Copy path截取字符串.html
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截取字符串.html
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<!DOCTYPE html>
<html>
<head>
<title>截取字符串</title>
<meta charset="UTF-8">
</head>
<body>
<script>
const a = `<img src="http://image.hzyuewan.com/sucai/15650039652432.jpg">`;
const c = `飞机飞过天空，天空之城飞机飞过天空，天空之城飞机飞过天空，天空之城飞机飞过天空，天空之城飞机飞过天空，天空之城飞机飞过天空，天空之城飞机飞过天空，天空之城飞机飞过天空，天空之城`;
const res = changeStr(a);
console.log(res);
function changeStr(str) {
// 首先判断是否存在img标签
const imgNum = str.indexOf("<img");
if (imgNum == -1 || imgNum > 20) {
return str.substring(0, 20);
} else if (imgNum >= 0 && imgNum <= 20) {
return str.substring(0, imgNum);
} else if (imgNum == 0) {
return "";
} else {
return "";
}
}
</script>
</body>
</html>