在网上找了一段代码是在光标出插入的

$.fn.extend({ insertContent : function(myValue, t) { var $t = $(this)[0]; if (document.selection) { this.focus(); var sel = document.selection.createRange(); sel.text = myValue; this.focus(); sel.moveStart('character', -l); var wee = sel.text.length; if (arguments.length == 2) { var l = $t.value.length; sel.moveEnd("character", wee + t); t <= 0 ? sel.moveStart("character", wee - 2 * t - myValue.length) : sel.moveStart("character", wee - t - myValue.length); sel.select(); } } else if ($t.selectionStart || $t.selectionStart == '0') { var startPos = $t.selectionStart; var endPos = $t.selectionEnd; var scrollTop = $t.scrollTop; $t.value = $t.value.substring(0, startPos) + myValue + $t.value.substring(endPos,$t.value.length); this.focus(); $t.selectionStart = startPos + myValue.length; $t.selectionEnd = startPos + myValue.length; $t.scrollTop = scrollTop; if (arguments.length == 2) { $t.setSelectionRange(startPos - t,$t.selectionEnd + t); this.focus(); } } else { this.value += myValue; this.focus(); } } });

开头一直报错，然后我改成了 function insertContent(myValue, t) {}
结果发现 var $t 报错， $t直接消失了，我是嵌套在php里面的，按理说php并没有解析，但是他就是消失了