js下通过prototype扩展实现indexOf的代码
复制代码 代码如下:
<script type="text/javascript">
Array.prototype.indexOf = function (str) {
for (var i = 0; i < this.length; i++) {
if (str == this[i]) {
return i;
}
}
return -1;
}
</script>
<script type="text/javascript">
Array.prototype.indexOf = function (str) {
for (var i = 0; i < this.length; i++) {
if (str == this[i]) {
return i;
}
}
return -1;
}
</script>
