首頁(yè) 猿問(wèn) 我想實(shí)現(xiàn)如下的功能，請(qǐng)問(wèn)如何實(shí)現(xiàn)?

我想實(shí)現(xiàn)如下的功能，請(qǐng)問(wèn)如何實(shí)現(xiàn)?

Java

Cats萌萌 2022-11-03 13:09:00

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2 回答

慕少森

TA貢獻(xiàn)2019條經(jīng)驗(yàn) 獲得超9個(gè)贊

你犯了一個(gè)錯(cuò)誤，$.G(str)返回的是dom對(duì)象，getValue() 卻是$.G下面的方法。
改成這樣就可以了
<html>
<head>

<script type="text/javascript">
var $ = {};
$.G = function() {
var a = arguments[0];
var b = (arguments[1] == null) ? false : true;
var c = typeof (a);

if (!b) {
switch (c) {
case "string":
a = document.getElementById(a);
break;
case "object":
break;
}
} else {
if (c == "string") {
a = document.getElementsByTagName(a);
} else {
a = null;
}
}
this.getValue = function() {
if (a.tagName == "INPUT") {
return a.value;
}
else
return a.innerText;
}
return this;
}
function getSelected(obj) {
alert($.G(obj).getValue());
}
</script>

</head>
<body>
<div id="msg">
dddddddd</div>
<input type="text" id="txt" value="inputvalue"/>
<input type="button" onclick="getSelected('txt')" value="取text" />
<input type="button" onclick="getSelected('msg')" value="取div" />
</body>
</html>

反對(duì) 回復(fù) 2022-11-08

慕碼人2483693

TA貢獻(xiàn)1860條經(jīng)驗(yàn) 獲得超9個(gè)贊

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>JavaScript 測(cè)試</title>
<script type="text/javascript">
$ = {};
$.G = function(a, b) {
var obj = null;
var c = typeof(a);
if(b) {
if(c == "string") obj = document.getElementsByTagName(a);
} else {
obj = (c == "object") ? a : document.getElementById(a);
}
return {
getObject: function() {
return obj;
},
getValue: function() {
return obj ? obj.value : null;
}
}
}
</script>
</head>
<body>
<input type="text" id="text1" value="1" />
<input type="button" id="button1" value="測(cè)試" onclick="alert($.G('text1').getValue());" />
</body>
</html>