if/etc语句中的函数声明?
var abc = '';if(1 === 0){
function a(){
abc = 7;
}}else if('a' === 'a'){
function a(){
abc = 19;
}}else if('foo' === 'bar'){
function a(){
abc = 'foo';
}} a();document.write(abc); //writes "foo" even though 'foo' !== 'bar'foo19.
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