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function insertAtCursor(myField, myValue)
{
if (document.selection)
{
myField.focus();
sel = document.selection.createRange();
sel.text = myValue;
}
else if (myField.selectionStart || myField.selectionStart == "0")
{
var startPos = myField.selectionStart;
var endPos = myField.selectionEnd;
myField.value = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);
}
else
{
myField.value += myValue;
}
}
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function test()
{
if(document.a.b.value.length>50)
{
alert("²»Äܳ¬¹ý50¸ö×Ö·û£¡");
document.a.b.focus();
return false;
}
}
</script>
<form name=a onsubmit="return test()">
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var foo = "test";
if(true){
var foo = "new foo";
}
//´ËʱfooΪ"new test"
alert(foo == "new foo");
function test(){
var foo = "old test";
}
//µ÷ÓÃʱ£¬fooÖ»ÔÚº¯Êý×÷ÓÃÓòÄÚÆð×÷ÓÃ
test();
//foo»¹ÊǵÈÓÚ"new test"
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